Add baking power
You do not treat pool water hardness with chemicals. If you have hard water in your area then you need to know what the allowable maximum of water hardness is before the water needs to be changed. You remove or reduce the hardness in water by draining and refilling the pool. K
The recommended frequency for checking calcium hardness in swimming pools is once a month. Other water tests will depend on how often the pool is used.
Hardness increaser from your pool supply company
The best way to lower calcium hardness in the pool water is to drain the water and refill with water of lower calcium hardness. Have the calcium hardness tested for both the pool water and fill water. Ideal range is 175-300ppm. There are 'calcium reducer' products available through pool stores, but not sure how effective or economical they are.
it means your swimming in a pool with dirty water and fish.....get out!
Chlorine, bromine, uv, ozone.
try the following web address http://www.swimmingpoolssupply.com/tag/maintaining-indoor-swimming-pool/
Reduces alkalinity of swimming pool water (softens hard water)
Chlorine is added to swimming pool water to disinfect it.
If the calcium is a result of pool chemicals, draining some or all of the pool water will lower the calcium hardness level. If the cause is the fill water, commercial hardness reducers or chelating agents will bond with the calcium to keep it trapped in solution.
Water is changed when calcium hardness, cyanuric acid, or total dissolved solids become too high. In Las Vegas we recommend every two years due to high calcium hardness.
The swimming pool in Beijing Water cube is 13 metres deep