footie Posted May 20, 2011 Report Share Posted May 20, 2011 Generally the advice here is to keep the calcium hardness between 80 - 400 (I think) but was on a site that sells chemical the stated that you should only start to worry about this when it reaches as 10ppm My question is who is right here?????? Quote Link to comment Share on other sites More sharing options...
waterbear Posted May 20, 2011 Report Share Posted May 20, 2011 Generally the advice here is to keep the calcium hardness between 80 - 400 (I think) but was on a site that sells chemical the stated that you should only start to worry about this when it reaches as 10ppm My question is who is right here?????? If you are talking about an acrylic spa then 10 ppm or even 0 ppm is not going to have any adverse effects other than a greater propensity to foaming. Does this site sell defoamers and enzymes by any chance? Quote Link to comment Share on other sites More sharing options...
samuel Posted June 1, 2011 Report Share Posted June 1, 2011 Generally the advice here is to keep the calcium hardness between 80 - 400 (I think) but was on a site that sells chemical the stated that you should only start to worry about this when it reaches as 10ppm My question is who is right here?????? If you are talking about an acrylic spa then 10 ppm or even 0 ppm is not going to have any adverse effects other than a greater propensity to foaming. Does this site sell defoamers and enzymes by any chance? Generally we try to keep people at 50- 150 ppm on calcium. Quote Link to comment Share on other sites More sharing options...
PreservedSwine Posted June 1, 2011 Report Share Posted June 1, 2011 What are you using as a sanitzer in your spa? Quote Link to comment Share on other sites More sharing options...
chem geek Posted June 2, 2011 Report Share Posted June 2, 2011 Most spas are acrylic so do not need the higher Calcium Hardness (CH) used to protect plaster surfaces (or grout used with tile). Nevertheless, we recommend using 120-150 ppm CH to help prevent foaming. You should not have the CH be too high since one can get calcium carbonate scale more easily in a spa due to the higher water temperatures (especially if the pH and/or TA are high as well). Quote Link to comment Share on other sites More sharing options...
footie Posted June 8, 2011 Author Report Share Posted June 8, 2011 My CH is 140, I was only surprise to hear someone saying down to 10ppm was OK and wanted to hear what the PROs here thought about that. Quote Link to comment Share on other sites More sharing options...
bajabill Posted June 26, 2012 Report Share Posted June 26, 2012 I currently have CH = 90, TA = 75, PH ranges between 7.3 ( add PH+) to 7.5 Have converted to bleach and have what I think is excessive chlorine usage and foaming battles at times. Would increasing CH help? Is is reasonable to have little or no FC in the morning after 1.5 people-hours soak and adding 4 oz of 6%clorox plain bleach? New tub with UV (does this eat chlorine) and I did a cursory spa flush and water change after 2 weeks, have not done a real high FC decontamination yet. Quote Link to comment Share on other sites More sharing options...
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