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For most residential pools, this is a trick question. One adds acid to reduce pH and Total Alkalinity. However, as total dissolved solids(TDS) build, say past 2,000ppm, pH of saturation will go towards 6.0. One can measure TDS, or use an estimating rule on when to change water to reduce TDS. To calculate days between complete water change, calculate ( Pool volume in gallons/3)/(bathers per day). For example, you have fifteen swimmers per day. Your pool is about 10,000 gallons. Then (10000/3)/15 yields: 222 days between changes. In a commercial pool, say you may have 100 swimmers per day in 100,000 gallons. Then (100000/3)/1000 yields: 33 days between changes.

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โˆ™ 2008-08-15 19:42:49
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Q: How can your pool have very high total alkalinity but very low pH?
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What do you use to raise the ph in a swimming pool?

the pH can be raised by adding an alkaline chemical such as soda ash (which also raises total alkalinity quite a bit) or borax (which has only a slight effect on total alkalinity), or by aeration of the water to outgas CO2 (which will raise pH with no impact on total alkalinity). Soda ash actually has very little effect on Total Alkalinity. Baking soda is the chemical to use to raise T/A.


If you have a good alkalinity with mains water what would lower it in a swimming pool with out the addition of chemicals.?

Add rain water this has very low alkalinity


Will pH minus lower pool alkalinity it is very high 300 at the same time the PH is very low 7.0. what needs to be done?

Yes. Adding pH minus (Hydrochloric acid) will lower your alkalinity. You should get it down to the 100 range or so, and the aerate the water to raise the pH to acceptable levels again.


How do you fix low stabilizer in your pool and low pH low alkalinity?

make sure chlorine is is at 1-3ppm, if pH is very low raise chlorine slightly higer than average. shock the pool after and run filter for over night. If pool still not stabilize then add PH high chemical.


What will reduce strong alkalinity without drastically increasing PH in pools?

pH and Alkalinity/Acidity are functions of each other. pH's above 7.0 are considered alkaline and pH's below 7.0 are considered acidic. So reducing the alkalinity will by it's very nature reduce the pH of the pool.


Why would the pool water turn black after filling if the chlorine and pH are good and alkalinity is high?

You would do better in contacting United Chemical in California. I don't have an answer for this one. Never heard of the problem before. Possibly very or extremely high amounts of iron or magnesium. k


If the Ph in a twenty-seven foot round pool is 7.2 how do you increase it too 7.5?

With the use of a very small amount of soda ash. Maybe a quarter cup. To be safe use smaller amounts and check the pH frequently until you have stabilized the pH at a level that is satisfactory. A pH of 7.2 is not that far out of bounds if you do not have a heater. You might also want to check the total alkalinity. If it is on the high end of the scale or test I would do nothing to raise the pH. The low pH will buffer the high alkalinity.


If you do not have enough sand in the filter would that keep your pool from clearing up?

Possibly. But have you checked the chemical levels 1st - chlor, pH, Total alkalinity? Are you running the filter/pump long enough? Run 24/7 until pool is very clear then cut back to about 8 to 10 hrs.


What can you do about very rough bottom and sides in your concrete pool?

Replaster the pool and keep the water chemically balanced (PH, alkalinity level etc..) this will keep the plaster from pitting thus keeping it smooth for a longer life.


Does high alkalinity cause cloudy water?

it might not be to high of a ph but could be a very hot water in a cooler room that is how some pools r cloudy


How do raise the alkalinity in my pool?

Adding 2 oz. of sodium bicarbonate (baking soda) per 1000 gallons of water will raise the alkalinity 10 parts per million. Despite raising the alkalinity to the desired level in my vinyl-sided pool the pH was not adversely affected. Increasing the pH of the water without affecting the alkalinity is very easy, but there is a trick. With the pump motor on and water circulating, add the sodium bicarb. in the deep end of the pool and work your way around the perimeter. This will raise the pH with minimal effect on the alkalinity. Keep your pH around 7.6-7.8, not 7.2-7.4. Most "pool experts" tell you 7.2-7.4 but they are using an index that your local water company uses which obviously should not be used for pool. There's a big difference between a water treatment system and your pool. You can't treat them the same. The chart you need is in the link below.


How do I raise the alkalinity in my pool?

Adding 2 oz. of sodium bicarbonate (baking soda) per 1000 gallons of water will raise the alkalinity 10 parts per million. Despite raising the alkalinity to the desired level in my vinyl-sided pool the pH was not adversely affected. Increasing the pH of the water without affecting the alkalinity is very easy, but there is a trick. With the pump motor on and water circulating, add the sodium bicarb. in the deep end of the pool and work your way around the perimeter. This will raise the pH with minimal effect on the alkalinity. Keep your pH around 7.6-7.8, not 7.2-7.4. Most "pool experts" tell you 7.2-7.4 but they are using an index that your local water company uses which obviously should not be used for pool. There's a big difference between a water treatment system and your pool. You can't treat them the same. The chart you need is in the link below.

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