Hi all! I am sorry if this is getting way redundant. I have read several threads on the subject and still haven't determined if TFP Experts or anyone for that matter has definitively answered the question. My 24ft vinyl above ground pool with fiberglass stairs has a calcium hardness of 50ppm. I have been adding in small portions driveway heat in an attempt to raise the level. So far there is no change. Should I add more or leave it alone??? Thanks for any response.