Help me with My Numbers?

[chem geek]

Mike,

I wouldn't worry about your calcium. It is definitely not too high given your lower TA level. I assume you may be keeping your TA low to slow down the pH rise normally associated with an SWG. Your higher CH is good to have when the TA is low.

Your CYA is at 90 which seems high. Even the SWG manufacturers say "70-80 with 80 best" though we aren't really clear why they say that (we have some ideas, but no definitive answers). So if you lower your CYA a little by dilution, then your CH will lower a little as well (and your TA will also, so you'll need to add more of that).

If you were planning on lowering your pH from the current 7.8, then the combination of low TA with lower pH (say, 7.5) might just start to be something to take a look at -- normally you would increase the TA at that point, probably to 80, but there is nothing wrong with running your pool closer to a pH of 7.8 since that pH with a TA of 60 should have less pH rise over time.

Richard

[mkfmedic]

Thanks Richard,

I have been attmpeting to keep the Alk low to slow pH rise. Advice I learned here on the site. I have been watching my Cal rise over the last few months and have begun to worry when too much is too much. I appreciate your advice and input.

The Cya is another story. I have not added any since I originally started the pool, so there is a possibility that that number may be the result of user error. From what I understand, Cya cannot be removed without dilution, but it should not rise without the addition of Cya?

I will recheck my numbers and look at the Cya numbers again and if it still remains high, I reduce it through dilution and then raise the TA appropriately.

Thanks again,

Mike