I realise that Calcium is usually present in fill water. Our fill water is about 190-200. I understand that as water evaporates and new water fills, calcium will increase.

But our pool was filled last August. My calcium level is 430. Assuming that the fill water had the same calcium level then as it does now, is it unusual to have a pool that increases 230-240 points in 10 months?

Just looking for alternate sources of calcium to explain the increase and protect against.

Thanks.

22,500 inground, gunite/plaster, poolpilot digital SWG, 45 sq ft DE, 7 foot spa, 1.5 hp pentair pool pump, 2.0 hp pentair spa pump, solar

test results this morning.

Salt 3200
FC 3.0
TC 3.0
Alk 90
Ph 7.4
Cal 430
CYA 40