calcium

[circus]

Hello, could someone tell me what causes calcium to rise? thanks


fc 4
cc 0
tc 4
ph 7.8
ta 100
ch 400 and rising
cya 60

15000 inground, plaster, d.e. filter

 

[JasonLion]

Welcome to TFP!

If your plaster was applied less than a year ago, CH will be constantly going up.

If you use cal-hypo, it contains calcium.

If you add calcium increaser (calcium chloride) obviously your calcium will go up.

If your PH is really low or PH/TA/CH levels are collectively low, calcium will go up. But neither of those are the case based on your numbers.

 

[circus]

Thanks for the reply. Is draining some water the only way to lower it?

 

[JasonLion]

Replacing water or getting a reverse osmosis treatment (which is only available in some areas) are the two ways to lower CH.

I left off a reason why CH might be high. If your fill water calcium level is medium or high, adding water to the pool to replace evaporation will raise the calcium level.

 

[circus]

Is there a time limit to get it down to a better number. i am going to remove the cover to promote more evaporation, unless that will not be quick enough.

 

[Richard320]

Is there a time limit to get it down to a better number. i am going to remove the cover to promote more evaporation, unless that will not be quick enough.

Evaporation will just make it worse! Water evaporates, Calcium stays behind.

 

[JasonLion]

With CH at 400, you are fine for now. As it goes up you should lower your TA a little. If it keeps going up you need to slowly lower the highest you let PH get. Those two measures will work well until CH is around 600 or 700, and can scrape by with CH up to 1,000 if you are really careful.

 

[circus]

Thank you