Gunite and plaster have a high demand for acid because of the lime in the cement. And or high calcium make up water.
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Your pool will naturally increase in pH due to swimmer's waste, sweat, urine, etc...
Keep your pH at 7.6-7.8, not 7.2. 7.2 pH is base upon the Langelier Index which was used for local water companies, but there's a world of difference between pools and how the water company treats your tap water. Good index but bad application for pools.
Soda ash (sodium carbonate), sold as pH Increaser, pH UP or Arm & Hammer Washing soda, will raise swimming pool pH levels.
You can also use borax, sold as 20 Mule Team Borax.
How to maintain those levels varies from pool to pool. If you are chlorinating with trichlor tablets, which are acidic, you'll need periodic additions of soda ash or borax to compensate for the acidity in that form of chlorine.
The source of your water that you add into the pool will increase the PH level. Also the chemicals you might be using will also do the same thing. Any chemical that may have Sodium in it will increase the level.
Usually the sanitizer your using is what causes pH to increase.
If you use a steady diet of Liquid Chlorine (Sodium Hypo) your pH will increase as well as your TDS (Total Desolved Solids)
Also, if you have a salt water /chlorine generator, the by product of generating chlorine is sodium carbonate (pH increaser)
Calcium Hypochlorite (granular shock) will also raise pH levels in a pool.
Bromine, Trichlor have a very low pH and will lower the pH level in your pool over time. Hope this helps.
Plaster pools always have a demand for acid. It is the alkaline in the lime etc.
Maintain pH weekly.
There is only one thing other then the addition of salt that could cause the salt level in the pool to go up and that is the water evaporating and not being toped up wit fresh water.
As part of the process of converting salt into chlorine the water becomes more alkaline ( higher pH ) You'll need more acid than a regular chlorinated pool.
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.
Increasing the temperature will cause the pH to decrease.
When CaOCl2 is added to H20 the chlorate ions combine with the water to produce hypoclorous acid and hydroxide ions. The pools pH is subjected to alot of different vaiables the optimum pH for pools is between 7.2-7.8 so to lower pH add HCl or NaHSO4 or to raise pH add Na2CO3 or NaHCO3.
You will have to add an alkaline substance in order to get the kiddie pools water back to an acceptable PH level. Calcium carbonate would work to increase the PH.
pH value is very dependent on the temperature.
neutralization
PH levels make sure water is not to acid.
A base or alkali affects the pH water by increasing it.
The websites in Related links are useful. They have the information you need for soil and swimming pools.
Can be anything, there's no strong link between pH and temperature. -------------- When the temperature is increasing the pH of water is decreasing and the ionic product (Kw) is increasing; at 50 0C the pH of pure water is 6,43. See the link below for the theory and for a table of pH.
well if the PH is above 7 it is a base and if it is below it is an acid... if we swam in swimming pools that were acidic... that would be bad. i don't know about landfill sites...
Sulfuric acid is added in pools to control the pH of the water; many specialists don't recommend the use of H2SO4.