Will lower Ph reduce oversaturation

Problems relating to pH and total alkalinity.
Increase ph, increase TA. Reduce pH, reduce TA.
pH chemistry advice and techniques for the pool.

Will lower Ph reduce oversaturation

Postby KDMoore » Sat 27 Jun, 2009 11:23

Having trouble balancing pool water. Trying to raise Ph and TA (total Alkaline?) to hold chlorine level. Pool is cloudy with slight foam on top.

chem geek
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Will lower Ph reduce oversaturation

Postby chem geek » Sat 27 Jun, 2009 15:50

pH and TA have little to do with holding a chlorine level. If the chlorine is getting lost during the day (more than 50%) but holds overnight, then you probably don't have enough Cyanuric Acid (CYA) in the water.

On the other hand, if the water is cloudy due to a nascent algae bloom, then you may have too much CYA in the water and not enough Free Chlorine (FC) so the algae is consuming chlorine faster than it can kill the algae. You may need to dilute the pool water to reduce the CYA level and then maintain an appropriate FC relative to the CYA level. Read the Pool School for more info about this (including the chlorine/CYA chart). Or alternatively if you want to continue to use stabilized chlorine (e.g. Trichlor pucks/tabs), then you should use a regular algaecide (at extra cost) to prevent algae growth.

If the pH, Total Alkalinity (TA) and Calcium Hardness (CH) are high in combination, then the saturation index may be high and that can lead to cloudiness. You can calculate the saturation index using The Pool Calculator. If the CH is high but the CH in your fill water is lower, then dilution will lower the CH. If the TA is high, then it can be lowered via the procedure described in this post. If the pH is too high, then acid can be used to lower it, but if the pH tends to rise over time, then the TA is probably too high.

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