Old School HTH Chlorine

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bover907

Gold Supporter
Sep 11, 2020
100
Pennsylvania
Pool Size
13148
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
CircuPool SJ-40
When I was a kid, my parents used to buy a big cardboard drum of HTH Granules. I don't remember them putting up with all the complications people have today with "Stabilized" Chlorine pucks, etc.

I'm 49, and was too young to remember what the the HTH contained, but I suspect it were just a granular form of sodium hypochlorite. I could be wrong though. If I'm right, how come no such product exists today? The only chemicals I remember my parents mentioning are Chlorine, soda ash, and a third which I don't recall.
 
I suspect it was calcium hypochlorite. Which exists today.

It leaves calcium. If your fill water is low in calcium and you backwash/drain a lot of water, use it.
 
I now have a SWG, but just wondered what happened to a seemingly uncomplicated product. If it was indeed pure cal-hypo, it looked a lot different than the cal-hypo I used a few years ago. White flakes, as opposed to the greyish granules that cal-hypo looks like today. I used cal-hypo as my only chlorine source for two years once, and got massive calcium scale in a vinyl pool. This was like over 10 years ago.
 
Chlorine gas has to be attached to something. In today's world, it is either Cyanuric Acid, Calcium, or Water.
In the past they did produce Lithium Hypochlorite. But with the use of Lithium in batteries and other present day technologies, I have not see Lithium Hypochlorite for some time.
 
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