Increasing CH

Winger 03

Well-known member
Sep 7, 2009
197
Frederick County, MD
OK, so I need to bump my CH up, and I am currently sitting at 110 or so.

Pool calculator shows that I need 410 oz (25.62 lbs) of calcium chloride to get to 250.

I have a bag of Dowflake Calcium Chloride (77-80%) in the garage that I used to melt ice in the driveway.

Is this OK to use, and does it matter if it is a bit old (say a couple of years or so)?

To put it in, just dump like I add salt, or is there a different method?
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
Dowflake is just fine. It is essentially pure calcium chloride dihydrate. Calcium chloride stores very well, it should be fine even after many years.

The best way to add it is to distribute across the surface of the deep end and then brush the pool or run the pool cleaner. You can also pre-dissolve and pour that in front of a return jet with the pump running. If you do pre-dissolve, be aware that calcium chloride gets very hot when it is dissolved, so watch out and don't get burned.
 

Winger 03

Well-known member
Sep 7, 2009
197
Frederick County, MD
Thanks Jason.

I think I will go the dissolve and pour route at first. I am sure when I get more comfortable dumping "ice melt" into my pool, I will be less cautious. :eek:)

I am sure I will get lots of looks from people when I tell them I use ice melt and bleach to keep the pool so sparkly.
 
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