I know this is a very old topic...and I am new to this forum...But, I am a new pool owner of a semi-inground pool with a Hayward Gas Heater (150,000 BTU).

I do not knnow what the coils are made of...But, Hayward said that calcium should be at 200ppm - 400pmm. That sounded high and the guy I spoke too sounded new...reading scripts. (Must be sumemr help becasue the people I spoke to in the winter during my research were very knowledgeable).

In either case, I was wondering how to test for calcium and if I should keep it as high as 200pmm in my Vinyl semi-inground pool ?

Thoughts ?

Hopefully, I will turn my pool on this weekend after the electrician comes...this is the first pool I owned othet than a 10 foot round Intex.