Calcium Hardness Levels for Heater

[chem geek]

There are also pools over 10 years old reporting on these forums with copper in their gas heaters and ZERO calcium or in some cases very low calcium in their water and they have no problems whatsoever. My own tap water only has 50 ppm CH, but the municipal water district does add 300-500 ppb phosphates for corrosion control, but that's mostly to prevent lead (and to some degree copper) leaching, not so much for preventing corrosion to the extent that there would be leaks. The pH is also kept higher and that's the most important factor to preventing metal corrosion.

Calcium carbonate saturation is really for protecting surfaces that have calcium carbonate in them including plaster and grout.

[bottomcat]

Thanks chem-geek. I'm learning from your posts. Personally, I changed majors after 3 semesters of Chem-E.

@FBU: I'm just a lurker at TFP. Heater is only one season old.