cya in pucks

[Hothead]

At a pool party this weekend , i was explaining my new found hobby,understanding pool chemistry!
when a friend said " how many gallons of water would he need to remove from his pool weekly to keep his cya levels the same, using 3 8 oz.pucks weekly?
I said not sure but I know where to find the answer

 

[EVChargeGuy]

I guess one needed piece of data to work this out is how many gallons of water is in his pool?

 

[jmastron]

You can use PoolMath to figure this out: http://www.troublefreepool.com/calc.html

For example, for a 10,000 gallon pool, under "Effects of Adding Chemicals" selecting 24oz of Trichlor says it will "raise CYA by 10". Then going up to the CYA section, putting current=50 and target=40 gives "To lower CYA you replace 20% of the water".

The actual percent and number of gallons to replace is going to depend on the size of the pool and the starting CYA level.

 

[Mr Bruce]

Yep. In Hothead's pool about 25% per week. In my pool, closer to 15% per week, targeting 30. Use pool math to determine how much CYA 3 pucks adds, then use your new "current" and target for water replacement.

 

[Hothead]

Once you explained it to me .its so obvious!!! I felt kind of dumbfounded ....Thanks again