The ph of calcium hypochlorite

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
16,962
Tucson, AZ
Calcium hypochlorite is a powder that doesn’t have a pH. The pH of a calcium hypochlorite SOLUTION depends on its concentration and how much water you mix it with. Cal hypo has both calcium hydroxide and calcium oxide in it as a by-product of manufacturing. Mixing it in a 5 gallon bucket will create a very high pH solution (well over 10); mixing it into a pool will probably just raise the pH only a tenth of a unit or so.

Liquid chlorine (sodium hypochlorite) is manufactured as solution because sodium hypochlorite does not exist as a solid material. The pH of LC is designed to be about 12.5-13 because that makes the solution very stable for storage. If bleach were manufactured with a pH of 7, it would emit chlorine gas and not last more than a few minutes.

The pH of these products is irrelevant to their use in pools. When you mix a pound of powder or a gallon of liquid into tens of thousands of gallons of water, there is very little effect on the pH of the pool water. Pool stores like to reference the high pH of liquid chlorine because it makes it sound scary and lets them sell you something more profitable to their bottom line.
 
Last edited:

amin36

In The Industry
Nov 24, 2017
71
shahsavar
"Calcium hypochlorite is a powder that doesn’t have a pH. The pH of a calcium hypochlorite SOLUTION depends on its concentration and how much water you mix it with. Cal hypo has both calcium hydroxide and calcium oxide in it as a by-product of manufacturing. Mixing it in a 5 gallon bucket will create a very high pH solution (well over 10); mixing it into a pool will probably just raise the pH only a tenth of a unit or so.

Liquid chlorine (sodium hypochlorite) is manufactured as solution because sodium hypochlorite does not exist as a solid material. The pH of LC is designed to be about 12.5-13 because that makes the solution very stable for storage. If bleach were manufactured with a pH of 7, it would emit chlorine gas and not last more than a few minutes.

The pH of these products is irrelevant to their use in pools. When you mix a pound of powder or a gallon of liquid into tens of thousands of gallons of water, there is very little effect on the pH of the pool water. Pool stores like to reference the high pH of liquid chlorine because it makes it sound scary and lets them sell you something more profitable to their bottom line. "

Very good information .thank you very much