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SWIMMING POOL CARE MADE EASY Take care of your pool and it will provide you
with enjoyable swimming year after year. This section will guide you through the
steps you should take from pool start-up, SIZING YOUR POOL You must know the amount of water that your
pool holds in order ROUND: Diameter x Diameter x Average Depth x 5.9 = Gallons RECTANGLE: Length x Width x Average Depth x 7.5 = Gallons OVAL: Long Dia. x Short Dia. x Average Depth x 5.9 Gallons For all other pools ask your builder, retailer, or serviceman for help. FILTER SYSTEMS There are three basic filter types:
diatomaceous earth (DE), sand, and cartridge. Remember, by filtering properly you will
help avoid contaminant You can protect your filter system by adding
the correct amount of sand WATER BALANCE Your pool is designed to hold the same water
for many years. You filter it and pH Measures the acidity or alkalinity of pool
water on a scale of "0- 14". TOTAL ALKALINITY Measures the level of certain minerals that
help control the pH of your pool water. HARDNESS Measures the level of calcium and magnesium
minerals present in your pool water. MINERAL CONTROL Is an important concern for pool owners who
use well water or for pools that STABILIZER Refers to "chlorine stabilizer",
the final part of pool water balance. This is a chemical SANITIZERS Now that your pool water is balanced and
stabilized, iris time to sanitize it with chlorine. SHOCK TREATMENTS Various contaminants such as swimmer waste,
lotions and oils can resist normal ALGAECIDES Algaecides are excellent treatments to
prevent or kill algae growth when used PRODUCT LIST STABILIZED CHLORINATING TABLETS (3"
Size) STABILIZED CHLORINATING TABLETS (1"
Size) STABILIZED CHLORINATING STICKS (2"
Diameter) STABILIZED CHLORINATING GRANULES . BROMINATING TABLETS (1" Size) . UNSTABILIZED CHLORINATING GRANULES . Fast
dissolving, STABILIZER * Slow dissolving, 100% active
granules, to pH INCREASER * Fast dissolving, 100% active, to raise pH. pH DECREASER . Fast dissolving, 95% active, to lower pH TOTAL ALKALINITY INCREASER . CALCIUM HARDNESS INCREASER SHOCK TREATMENT . Fast dissolving, 65% available ALGAECIDES . A variety of maximum strength
algaecides, SPECIALTY CHEMICALS . A variety oF specialties For
clarifying, TROUBLESHOOTING Sometimes even the most experienced pool
managers run into CLOUDY WATER Make sure the filter is operating properly
and the correct amount of filter ALGAE There are many types of algae that can
infect pool water. The most common types, COLORED WATER Reddish or brownish colored water is usually
caused by oxidized iron or manganese. STAINS AND SCALE Stains can develop when colored water is
left unattended or when metals CHLORINE: TOO HIGH OR TOO LOW Inability to hold a chlorine reading usually
indicates lack of STABILIZER in the water. WINTER CARE If you live in a climate that requires
winterization of your pool you 1. Have your water tested professionally and add
any necessarybalancers at this time.
SAFETY TIPS Your pool will bring years of safe and enjoyable swimming if you follow these simple rules. 1. No running, pushing, or foolish play in or near the pool. 2. No diving in shallow or unmarked pools. 3. Children must be supervised at all times. 4. Safety fencing should be added (check local building codes). 5. Keep a first aid kit and manual, a life ring, and a pole on site at alltimes.Browser Fixed Safe handling of chemicals should also be the rule. 1. Chlorine products emit powerful chlorine gas
and should never be opened 2. Label directions for use must be followed at all times. 3. Do not mix chemicals. A violent reaction can occur. 4. Never add water to chemicals. 5. Read all warning statements on product labels. 6. Do not take advise from others or experiment on your own. 7. Store all chemicals in a cool, dry place and keep sealed. 8. Most important of all, KEEP CHEMICALS AWAY FROM CHILDREN. ALGAECIDES: MANY CURES Algae are constantly infecting water through airborne contact which is accelerated by rain and wind. If algae spores are killed off as they enter the water by using repeated algaestatic or maintenance doses of algaecides, the incidents of alga bloom are effectively eliminated. This is an "insurance policy" approach compared to the cost of treating alga bloom. If algae does bloom (become visible), then the best approach is to adjust the pH= 7.2-7.8, shock treat the water with 7-10 ppm of available chlorine, brush all surfaces vigorously, and follow with a killing dose ( 5x maintenance dose) of algaecide. Continue to filter and backwash, if necessary, during the entire episode. According to the United States EPA (Environmental Protection Agency) all approved algaecides prevent and kill most strains of algae. There is no rule or clear-cut order to determine which algaecide to use, so choosing algaecides is similar to choosing medicines. Start with your favored choice and proceed from there. If algae persists, try another choice. Here are the algaecide choices and their characteristics:
All other approved algaecides are dilutions or blends of these four types.
Don't overlook the importance of performing Base Demand Tests if your pH is 6.8 or lower and Acid Demand Tests if your pH is 8.2 or higher. Many water samples are being reported with pH-- 6.8 when, in fact, the true pH might be 5.0-6.5! Taking time to perform the Base Demand Test will take the guess work out of adjusting the pH. Look at the difference: pH Reading Amount of Product Needed to Attain pH=7.5 If a pool owner uses 1.5 lbs. of Sodium Carbonate when 5 or 10 lbs. is actually required, the pH reading will still appear as 6.8. Rule of thumb: For each drop of Base Demand, use one-third (1/3) lb. of Sodium Carbonate per 10,000 gallons. The calculation for Acid Demand reveals a similar pattern with an extra complication related to the level of Total Alkalinity. This is especially true in hard water areas and with curing plastered pools. An extra amount of acid may be needed to lower the both Total Alkalinity and pH. pH Reading Amount of Dry Acid Needed to Attain pH= 7.5
For those who prefer Muriatic Acid, the conversion factor from Dry Acid to Muriatic Acid (Hydrochloric Acid) is: 10 lbs. of Dry Acid -- One (1) Gallon of Muriatic Acid Because of the connection between high pH and high Total Alkalinity the following information should be considered. The most common technique to reduce Total Alkalinity is to pour Muriatic Acid in a series of "pockets" in the deep end of a pool, keeping away from the walls and floor, if possible. Use of Muriatic Acid seems to reduce Total Alkalinity with less impact on pH than use of Dry Acid. Rule of thumb: 1 Gallon of Muriatic Acid reduces 60 ppm of Total Alkalinity in 10,000 gallons.
ALGAE: SOME STUBBORN FACTS Algae, algae, algae... green, black, mustard, and pink. Why do you use algaecides? When do you dose? Which one? How much? These questions are asked over and over again. It seems that everyone has their own opinions about algae control and here are some of the most widely held beliefs: Algaecides are not necessary because chlorine kills all. This may be true in theory, but the chlorine level must be kept high at all times (3 ppm or higher) and not permitted to slip. This can be expensive, irritating to swimmers, will lead to bleached swimwear and vinyl liners, and is difficult to maintain. Even in high chlorine, some algae "habitate" or become accustomed to a steady level. In tropical areas, for example, black algae sets "roots" and seals itself with a tar-like coating that is unaffected by high levels of chlorine. Mustard algae is another algae that seems to thrive in chlorinated water. Algaecides are killers and Algaestats are preventatives. This may be true by definition but one product does both jobs. The EPA does not recognize the difference between killing visible algae (Algaecide) and killing invisible algae (Algaestat). Invisible algae sounds like a contradiction but, in fact, thousands of algae are growing before they become visible in an algae bloom.
Algae doesn't grow in low pH water. Not true. The most common types of algae such as "planktonic blue-greens" prefer pH= 7.4-9.0. but many types live in pH-- 5.0-7.0. During periods of hot weather and intense sunlight, photosynthesis is at its peak. As algae grow, carbon dioxide (food for algae) is withdrawn from the water and the pH drifts upward. It is most common to see a green pool with a pH-- 8.0.
Algae doesn't grow in cold water. Temperatures have to drop to near freezing before algae move into a dormant state. Studies in the Arctic Circle indicate that as long as light is present algae will grow. Algae can be filtered out of water. This is true for "colonies" of algae that are visible in the water, but is not true for single ceil algae, for example, that exist as small as 0.5 micron. Diatomaceous earth (DE) filters particles down to 1-3 microns, sand filters particles down to 15-20 microns, cartridge filters particles down to about 20 microns. Generally, if you can see it, you can filter it.
CHELATORS & SEQUESTRANTS The word CHELATE is derived from the Greek word for "claw". In pool and spa chemistry chelate means a chemical treatment to control or "coat" soluble metal ions and prevent their oxidation into unwanted colored precipitates. A chelator attaches to a metal ion like copper or iron and wraps around it like a claw. There are many types of chelators available in the market. Among the most widely used is a group of organic acids called "amino polycarboxylic acids". These chemicals are usually formulated into liquids that quickly attach to copper or iron ions and deactivate them. Please note that chelators will not react with metals such as finely divided iron shavings and they react very slowly with metals that are already oxidized or precipitated. Sequestrants differ from chelators in the way they "coat" or react with mineral ions. Sequestrants generally have a few active sites on each molecule allowing it to control two or more metal ions at a time. Because of this, sequestrants are often more powerful as stain removers and are often sold with specific stain removal directions. FACTS ABOUT CHELATORS & SEQUESTRANTS Many chelators and sequestrants have metal ION PREFERENCES called "displacements". This means that certain metal ions will be coated before others. The usual preference is iron, then copper, then manganese, then calcium, then magnesium. There are chelators that favor calcium first.
The EFFECTIVENESS of chelators and sequestrants to
coat undesired metal ions depends on the concentration of the ions to be chelated. For
example, it is easier to control 1 ppm of copper and 1 ppm of iron in soft water (50 ppm
of calcium) than in hard water (350 ppm of calcium). The presence of 350 ppm of calcium in
water, for example, will occupy a large portion of the chelator intended to control the
copper and iron. With this in mind it is advisable to chelate or sequester undesired metal
ions before adding calcium to the water. The AMOUNT of chelator or sequestrant needed
depends on the type of metal ions present. For example, copper, iron, and manganese all
require about the same amount of chelator whereas calcium requires 50% more chelator.
Reactions to control metal ions occur within seconds in most cases. Chelators and sequestrants are PH AND
OXIDIZER sensitive. Very low pH, occurring in a "pocket" of water where acid has
been added, can cause loss of chelation. Very high pH, again a "pocket" effect,
can also cause chelation failure and precipitation of copper or iron. Because most
chelators and sequestrants are organic molecules, they are subject to attack by high
levels of oxidizers and "wear off' over time. This is the reason that most product
labels state that continued additions may be necessary to control metals. With this in
mind, it is obvious that shock treatments should not be performed directly after chelators
or sequestrants have been added. TEMPERATURE and TDS (Total Dissolved Solids)
have slight effects on chelation. According to manufacturer studies, high temperature and
high TDS increase the amount of chelator or sequestrant needed.
Soluble metal ions such as copper or iron can exist in water
in three different forms. They are: 1) Unreacted ions. Colorless but ready to react in some
manner such as oxidation. Chelators and sequestrants chemically coat ions in any of the
three states. Effectiveness varies based on pH, sanitizer level, calcium level, depth of
stain and amount of stain. An acid wash is an extreme example of pH control.
Strong acid breaks the bonds of reacted ions and releases the ions to the unreacted state.
Strong alkali such as sodium carbonate can bond with unreacted ions to form cloudy
precipitates which can be easily filtered or flocked and vacuumed to waste. Chemical reduction is the opposite of oxidation. It can be
used effectively to reverse reacted iron either in the colored or precipitated states.
Reduction brings the iron back to the unreacted state. Under certain conditions chlorination or other forms of
oxidation such as granular oxygen compounds or ozonation, are used to produce a cloudy
precipitate that is easily filtered or flocked and vacuumed to waste. Metal Control Products
The Cyanuric Acid (Stabilizer) test is perhaps the most inconsistent water test performed. Some of the problems of reporting and reproducing accurate Cyanuric Acid readings are: 1) Temperature of the sample. Try to keep and test the water sample at room temperature. The colder the water, the lower the test resuIt. 2) Waiting time before reading. Be consistent at the recommended 30 seconds before reading. The shorter the time interval, the lower the test result. 3) Viewing tube cloudiness. Due to a reaction with the Cyanuric reagent, Viewing Tubes become cloudy over a period of a few months. Be sure to rinse the Viewing Tube carefully after each use. Cloudy tubes are hard to read. 4) Reading higher levels of Cyanuric Acid. The markings of 60, 80, and 100 ppm level on the Viewing Tube are increasingly close together. Only a fraction of an inch separates the 60 ppm mark from the 100 ppm mark. Rather than guess in this higher range, redo the test by diluting the water sample in half with tap water to put the test result in a more readable range. Then double your reading to more accurately report the Cyanuric Acid level. Always dilute the water sample and redo the test when over 100 ppm. An interesting problem with Cyanuric Acid results is that high levels of Cyanuric Acid notably affects Total Alkalinity. When measuring Total Alkalinity follow this formula: Total Alkalinity - (Cyanuric Acid level x .30) = True Total Alkalinity
THE FUNGUS (Dark Stains On Liners)
During the past four years a small, but growing number of above ground and in ground vinyl liner pools have developed dark colored stains that do not respond to normal chemical treatments such as shock treatments or algaecides. Nor can these stains be brushed off or scraped off. They appear to be caused by unusual fungus attacks. In many cases these stains can be bleached out for a time ranging from one week up to two years (depending on the severity of the stain) using the following procedure: 1) Adjust the pH, if necessary, to 7.2-7.8 2) Adjust the Total Alkalinity, if necessary to 100-150 ppm 3) Turn off the filtration system and allow the water to sit. 4) Prior to this step it is
very important to note that Trichloro Granules should not contact the vinyl liner for more
than fifteen (15) minutes in order to prevent the vinyl liner from bleaching! 5) Spread the granules evenly over the stains and allow direct contact for 7-10 minutes. Then push the granular pile to the next affected area with a wide pool brush. For stains in sloped areas, pour granules into a deep-pocket leaf net and allow the net to lie on the affected area for 7-10 minutes. If granules fail through the mesh of the leaf net, an alternative approach is to pour about 1/2 lb. of granules into the toe of nylon panty hose. Nylon hose has a much finer mesh construction. In any event, the granules must not contact the vinyl liner for more than fifteen (15) minutes in order to prevent the vinyl liner from bleaching. Please test this procedure on a small area to determine your vinyl liner's reactivity. When the stain removal procedure is complete, start the filtration system and vacuum the remaining granules in the filter.
NITRIFICATION & CHLORINE DEMAND
How green is a green pool? When is a normal shock treatment the
correct dose compared to a treatment 3x normal? Or 5x? These questions test the imagination of anyone who is asked
to describe a "green pool." Maybe one should be asked, "Can you see the
shallow end bottom, the hopper, or even the deep end bottom?" WHAT IS NITRIFICATION? If green is really green,
it's a good bet that nitrification has taken place. Nitrification is a micro
biological process in which ammonia (NH3)is converted by oxidation into nitrite (N02) and
nitrate (N03). This process is carried out by two bacteria known as Nitrosomonas .
But first, ammonia must be formed. The sources of ammonia are quite plentiful: inorganic
fertilizers, plant protein decay (leaves etc.) and animal protein decay (bugs etc.)
Specialized bacteria decompose the proteins into ammonia in part of an ongoing cycle
called the NITROGEN CYCLE. (see Nitrogen Cycle Chart). Nitrosomonas, in turn, get their
energy or "food" from the newly created ammonia and carbon dioxide, both present
in the water. Once nitrification begins, an accelerating cycle develops. The nitrates,
once formed, are great algae nutrients! And as nitrates accumulate, algae bloom and
the water turns greener and greener. As the Nitrogen Cycle progresses, more and more plant
life becomes available for further bacterial decomposition into more and more ammonia. WHAT ARE THE EFFECTS? Nitrification leads to water
conditions that range from slight odor to major algae bloom. These conditions have been
observed in both swimming pools and in municipal waste water treatment systems. The color
can range from a light green tint to an emerald or dark green, or even a black. Water
clarity can range from a hazy deep end to almost solid color at a depth of a few inches. WHAT CONDITIONS FAVOR NITRIFICATION? The primary influence
is the level of ammonia present. And this level, in turn, depends on the level of
decomposing plant and animal life, and certain fertilizers. A second factor is pH,
especially in the range of pH= 7.5-8.5. A third factor is water temperature in the
range of70-85F. A fourth factor is periods of extended darkness (covered
pools) followed by exposure to sunlight (promotes algae growth). Clearly the "worst
case scenario" is a pool that is carelesslywinterized (not cleaned or
vacuumed, little or no sanitizer added),poorly covered (rips, pin holes, too small
etc.), and left covered late into the spring (long incubation and warming water). WHAT CAN BE DONE? Testing for Nitrification is too
complicated for a single test such as a nitrate test (being used by some pool dealers to
identify the problem). A nitrate test will only test one part of the cycle. Research *
indicates, for example, that Nitrosomonas bacteria secrete organic compounds that actually
stimulate the growth of other types of bacteria. A test for these bacteria would be needed
too. Data from the Metropolitan Water District of So. Cal. shows 5-10 ppm of chlorine
effective in controlling mild nitrification. Severe cases can require 25-50 ppm of
chlorine (5x shock treatment) and repeated treatments in some cases. * Handbook of Chlorination, Geo. Clifford
White, 3rd Ed. 1992 Copyright 2000 Alden Leeds, Inc.
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