Quote Originally Posted by PoolDoc View Post
Almost certainly, you have high-ish calcium and ended up precipitating calcium carbonate particles. So . . .

1. Use borax to raise your pH, and avoid the problem.
2. Get a K2006 so you can manage your pH/alkalinity/calcium levels properly. http://pool9.net/tk/
3. If your calcium is high because someone told you to add calcium, but you have an FG or vinyl pool, STOP adding calcium. There's no need for it. http://pool9.net/calcium/

. . . membership updated.
Thanks for updating!

1. Will do! Thanks for the tip. Are their guidelines on how much Borax to add? Is adding Borax to a hot tub OK as well? I just add backing soda to my hot tub until the pH is about right.
2. I live in Canada, so I have to use Amazon.ca, and those products are not available through that vendor... Too bad.
3. I have never added calcium to our water, but we do have high calcium (hard water with lots of iron).


I forgot to add:

So now that we believe it's a high calcium content: what can I do about it?

I was thinking about adding the clarifier to the filter like they recommend in the instructions (30mL to 50mL / 10,000 Litres). Says "may be added directly to the skimmer in the evening. The pool filter should be backwashed the next morning".