Re: Shouldl water chemistry be the same for all type pools?
fiberglass pools have a basically non reactive surface so water balancing is a bit easier. Generally the numbers used for a plaster pool are appropriate. There is some question on how much calcium, if any is needed for fiberglass but there seems to be some evidence that maintaining at least a 150 ppm calcium hardness can help prevent staining and 'cobalt spotting' (cobalt leaching out of the gelcoat.
Retired pool store and commercial pool maintenance guy.
Bookmarks