Pool Calculator Application

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NowTargetUnits U.S.MetricImperial
Size Mouse over a field for detail
FCGoal:Not SetupAdd of% bleach. Jug size 96 oz128 oz174 oz182 oz.or add by weight or by volume of trichlordichlorcal-hypo 48%cal-hypo 53%cal-hypo 65%cal-hypo 73%lithium-hypochlorine gas.Note: Dichlor and trichlor add CYA and lower pH. Cal-hypo adds CH.
pHGoal:Not SetupGiven TA of and Borate of:Add by weight or by volume of washing soda or soda ashor add by weight or by volume of borax.Add of 15.7% - 10° Baumé28.3% - 18° Baumé31.45% - 20° Baumé34.6% - 22° Baumé14.5%29% muriatic acidor add by weight or by volume of dry acid.Note: pH calculations depend on TA and Borate. Results are approximate and can be off significantly for large pH changes. Changing your pH will also change your TA.
TAGoal:Not SetupAdd by weight or by volume of baking soda.To lower TA you reduce pH to 7.0-7.2 with acid and then aerate to increase pH.Note: Adding baking soda will also raise your pH.
CHGoal:Not SetupAdd by weight or by volume of calcium chlorideor add by weight or by volume of calcium chloride dihydrate.To lower CH you replace of the water with new water, with CH of.
CYAGoal:Not SetupAdd by weight or by volume of stabilizeror add of liquid stabilizer.To lower CYA you replace of the water with new water.Note: It can take solid stabilizer up to a week to dissolve. It will also lower your pH.
SaltAdd of salt.To lower Salt you replace of the water with new water.
BorateAdd by weight or by volume of boraxboric acidtetraborate pentahydrateand of 31.45% muriatic acid to compensate for the pH increase.To lower Borate you replace of the water with new water.Note: The pH should be tested and adjusted as needed after increasing the borate level.
Temp Mouse over a field for detail
CSICalcite Saturation Index - requires pH, TA, CH, CYA, Temp, uses Borate, SaltLess than -0.6 is suggestive of problems for plaster, tile, stone, and pebble pools.Greater than 0.6 is suggestive of problems for all pools.
Suggested FC LevelsSWG: Normal: to Shock: Mustard Algae Shock:Suggested target FC levels based on the current CYA level for outdoor pools.Note: Be careful if your CYA is really and truly zero!
Suggested Goal LevelsUse suggested goal levels from: Not SetupTraditional PoolTroubleFreePool.comTraditional SpaPrimary source of chlorine: Not SetupBleachSWGTrichlor Pool surface: Not SetupPlasterVinylFiberglassNote: Suggested goals are simply a starting point. There are many situations that are not covered by these basic guidelines.

NotesUnless you are shocking your pool, it is always best to add less than the full amount, wait a little while to allow the addition to mix thoroughly, and then retest to see where you are. Also, keep in mind that the volume of powders can vary from manufacturer to manufacturer.

Estimating pool volumeA wide by long by deep rectangularovalround (ignores length) pool holds.If the depth varies, use the average depth of the pool. A good approximation is the shallow end depth plus the deep end depth divided by two. Irregularly shaped pools can be approximated by estimating the average length and width and using rectangular.

Effects of adding chemicalsAdding of 5.25% bleach6% bleach10% bleach12.5% bleachtrichlordichlor48% cal-hypo53% cal-hypo65% cal-hypo73% cal-hypolithium hypochloritechlorine gas15.7% muriatic acid31.45% muriatic aciddry acidwashing soda or soda ashborax (20 Mule Team)sodium tetraborate pentahydratecaustic soda (lye)baking sodacalcium chloridecalcium chloride dihydratestabilizerliquid stabilizersalt willNote: pH calculations are not exact. These numbers are only suggestive of the relative magnitude of the pH change you can expect. Small changes, +-0.4, with pH between 7.2-7.8, TA around 80-120, and Borate near zero will be approximately correct. The further you go from those ranges the less these pH changes will correspond to reality.

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