Susanj Posted July 4, 2020 Report Share Posted July 4, 2020 We have a bromine spa and have been keeping calcium at 75-150. But most guidelines I see say it should be higher, like 150-250? Or 250-450. I ' m trying to remember but I'm pretty sure we keep it low because when we got it, the manufacturer said it should be that for an acrylic spa. What do others do? Quote Link to comment Share on other sites More sharing options...
castletonia Posted July 4, 2020 Report Share Posted July 4, 2020 150-250 should be fine. Much higher than 250 and you could have scaling issues. Quote Link to comment Share on other sites More sharing options...
Susanj Posted July 4, 2020 Author Report Share Posted July 4, 2020 But we are doing 75-150. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted July 5, 2020 Report Share Posted July 5, 2020 Water balance is a combination of Ph, alkalinity, hardness, and temperature. This is called "saturation index" or Si. Even with ideal ph and alkalinity, low hardness can cause "aggressive" water which will corrode your heater, damage rubber gaskets, and make plastic brittle. It is not as serious as in a plaster or concrete pool, where it will deteriorate the pool itself, but it can be an issue. https://www.google.com/amp/s/blog.orendatech.com/langelier-saturation-index%3fhs_amp=true The taylor test kit k-2005 includes a slide-rule for calculations that is very convenient to use. What are your ph and alkalinity? Quote Link to comment Share on other sites More sharing options...
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