Return to the Pools & Spas Forum | Post a Follow-Up

Calcium levels and pool chemistry

Posted by kitamiman (My Page) on
Sat, Apr 2, 11 at 13:00

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.

Follow-Up Postings:

RE: Calcium levels and pool chemistry

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.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Pools & Spas Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here