Home Depot Canada Calcium Chloride Source - Which Ice Melter

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None of those are very good sources. The "eco friendly" ones do not contain any calcium at all and the traditional ice-melts that do often contain more sodium chloride (rock salt) than calcium chloride. Most of the MSDS's for the traditional ice melts say they contain only a max of 25% calcium chloride ... that's really not worth it. Something like this would be better -

https://www.walmart.com/ip/USOL-F05...640629?wmlspartner=wlpa&selectedSellerId=1148
 
Or, if you can find calcium hypochlorite to chlorinate with for a while, then you can use that to build up some calcium hardness. Do you really need to increase your CH?? Any CH over 100ppm is fine for fiberglass while you are taking time to build it up slowly with cal-hypo. You can even turn off your SWG (or turn it down) while you are using cal-hypo. The only thing you need to watch out for with cal-hypo is cloudiness that can occur from high pH as it tends to raise pH. You simply lower pH to 7.2-7.4 range BEFORE adding cal-hypo and then pre-dilute the cal-hypo in a bucket of water and add it slowly infant of a return jet. That usually helps to minimize any cloudiness.
 
Currently not running SWG as we open early In Toronto to use the Hot Tub only but heating the pool would be tres expensive :)
Pool is currently 46F after the recent cold spell.

Could use the Cal Hypo until water temp is up enough for SWG to work.

Raising my CH to 350 just to follow the recommended levels. Past season I've always been around 100 and not adjusted for CH.
 
Well it sounds like you can use cal-hypo to build it up slowly if you don’t mind the extra acid use to control pH. Just be sure to dilute it in a bucket as you really don’t want cal-hypo granules sitting on your FG shell.
 
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