Calcium levels and pool chemistry

kitamimanApril 2, 2011

So - we are finally filling up the pool, so for the first time in my life I am messing with pool chemistry. FYI, pool is fully tiled gunite with SWG.

First and major concern is calcium. Fill water is basically rainwater from a cistern, and initial test gives calcium of 50 ppm, which I gather is low. Problem is that in my location I do not have easy access to pool shop or chemicals, so while I know it needs calcium chloride I cannot easily get my hands on it. I have read that the low calcium level will make the water aggressive. Pool is fully tiled in 1" tiles, so there is a lot of grout.... How fast can damage happen? Do I need to be looking at flying in a sack of calcium chloride asap, or can it go as it is for a few weeks/months? What is the absolute minimum calcium ppm in my tiled pool to be able to sleep nights? There is some limestone locally - would a block in the deep end be sacrificial??

Also confused about total alkalinity/PH. Total alkalinity is currently 80 ppm, which suggests borderline OK (?) or possibly to add a little more alkali (baking soda), whereas the PH is 8.00, requiring acid....(?) There seems to be a conflict here....

Any help much appreciated. I am totally new to all this and flying solo with the help of Google and this forum - huge thanks to all who have responded to previous posts.

Thank you for reporting this comment. Undo

Rather than go through pool chems, I suggest you read what I consider the best on line pool school at to get a proper understanding.


    Bookmark   April 2, 2011 at 3:53PM
Sign Up to comment
More Discussions
New Pool in Louisiana
Wanted to share a few pictures of our new pool. It...
salt or chlorine? pebble or plaster?
We have finally decided to build a pool, and have had...
Our Pool Remodel with Mr. Carlos Pools
So after much searching and many quotes from diffirent...
Concerns about quartzscape plaster on new build
Yea, our newly constructed pool was plastered with...
Basement pool - How to prepare the room?
With some slight modifications to my garage (dropping...
Alex House
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™