How HARD is too HARD? (No Viagra Jokes)

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Squeeken

Squeeken

0
Apr 23, 2013
23
San Diego, CA
We moved into our home three years ago. Our plaster pool's Calcium Hardness has been steadily increasing from 450 in AUG2012 to 525 in JUL2013 to 650 today. I am not having any problems with scaling except for around one piece of granite stone on the spa overflow which has been there for at least two years. It has not spread or gotten any worse. The pool looks great.

My question is, how hard is too hard?
My tap water has a CH of 200. Should I do a water change, or not worry about it since all seems well?

My Test Results Today 04/17/2014 using Taylor K-2006C

Water Temp: 72
FC: 5.0
CC: 0.0
PH: 7.6
TA: 60
CH: 650
CyA: 35
Salt: 2700
Balance: 0.2

I know my CyA is low, but I wanted to get this question answered before I add the acid, in case I need to do the water change.
 
You should be able to maintain a neutral CSI without much problem until CH gets to about 800. I've been doing it for a few years.

If you got those results the old fashioned way, they may be reading high. My CH dropped a lot just by testing it using the speedstir.
 
Gradually, your CH will likely continue to climb. Maintain your pH in the lower 7's and your TA where it is and as Richard 320 says, you should be fine.

At some point, I would suggest around a 50% replacement of your water to drop CH where it will be more manageable.
 
My CH was 720 and I just tried to keep my pH at 7.2 to keep my CSI in the normal range. Off the top of my head I believe "normal" is between -.6 and .6 and as long as you fall with those numbers, calcium scale shouldn't be a problem.
 
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