Reducing calcium hardness

[bizbad]

The alkalinity here is low so it will bring everything in line.

[mas985]

I would test your fill water for calcium before deciding on replacement ratios. We have well water which can be very hard (read calcium) depending on time of year (we also get surface water) so even if I replace all of the water, my CH can be close to 400.

[Sweet]

If you do have Calcium in your fill water the BleachCalc program can help you determine how to achieve the correct dilution (See the Sticky: Using the Bleach Calculator). You find it under the "More Calc" menu within the BleachCalc program.

[giroup01]

Theoretically though would it possible to increase the pH to around 9.5-10, vacuum out the precipitated calcium, and restore the pH to normal?

[waterbear]

Theoretically though would it possible to increase the pH to around 9.5-10, vacuum out the precipitated calcium, and restore the pH to normal?

Theoretically yes but in actual practice you might find much of it comes out of solution as stain and scale deposits on the pool surfaces as opposed to a precipitate in the water.

[JerryZ]

Theoretically though would it possible to increase the pH to around 9.5-10, vacuum out the precipitated calcium, and restore the pH to normal?

If you have a SWG, and a return that comes off of it, ( pressure side cleaner, for example), you can put a fine mesh (pantyhose) on it and catch the calcium flakes.

[bizbad]

The calcium in my fill water is 50 and ta 80 ph 7.7. Have already started the drain and fill. Working just fine