Calcium Hardness - does it matter?

apv

Active member
Apr 30, 2019
38
Austin, TX
I am at low end of calcium hardness -- is it like phosphates in the TFP paradigm ie it doesn't matter. Or do I need to address it with some cal-hypo?

I have been using liquid chlorine almost exclusively up to now.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
7,792
Northern NJ
Post a complete set of test results. Record it on PoolMath and share the results.

Proper calcium levels are important for plaster pools. Use

 

Oly

Gold Supporter
Jun 28, 2017
1,095
Fresno, CA
Search for CSI, calcium saturation index. Pool Math will calculate your level. This is critical for the life of your plaster pool surface.
 

YippeeSkippy

Mod Squad
LifeTime Supporter
Jan 17, 2012
10,877
Evans, Georgia
Just to explain why proper calcium levels are important for plaster pools- if your water doesn't contain enough calcium, the water will leach calcium out of your plaster walls. That will weaken the walls.
No Bueno!

Maddie :flower: