unclefudgly

Thanks for the link, very interesting for sure. It does seem to be very informative , but also a bit confusing and no water balancing at all as far as I can see. Horses for courses hey? Always good to have a choice I think.

Hi all I hope the mods will allow this shameless plug as I think a few people could be interested, there's a new app in the app store called hotTub&pool for doing lots of pool calculations. Also has a really good waterbalancing feature to calculate LSI (Langelier) index. Would be great to get some feedback from all of you with all your years of experience. Regards Rod

Excellent! Thanks for clearing that up for me I was a bit lost.

Hi all I was just doing some figures from scratch for a new spa we're getting and my figures never agree with those from all the pool calculators around, the figures just do not match, the error seems to be in all cases regarding CH that none of the pool calculators take into account that calcium is only a percentage by weight of the total. for example: CaCl2.2H2O - cal flake is 147g/mol but only 40g of that is actual Calcium, so all the calculations I get are out by a factor of 2.5 . Where am I going wrong? Or are all the pool calculators wrong? Thanks