Dry chlorine powder

That's dichlor.

Straight off that webpage:
Active Ingredient:
Sodium Dichloroisocyanurate, dihydrate

Plugging it into Effects Of Adding Chemicals at the bottom of Poolmath

8 ounces of that in your pool raise FC by 1.1, raise CYA by 1, lower pH by 0.04, and raise Salt by 0.9.

So if you use 2.2 FC per day, you'll add 2 CYA per day. And drive the pH and TA down.

It is half the price of Leslie's Chlor-brite, though
 
If you are trying to find some mythical pure solid chlorine, you can stop as such a thing doesn't exist except under unbelievable high pressure or -151 degrees F. Any solid form of chlorine that you find at room temperature will be bound to something that you likely won't want building up in your pool.

Also they state that mixing 2.25 ounces of this in to 19 gallons of water will produce a 100 ppm solution. If that is the case then this powder is only about 1/5th pure. Aside of not knowing what the other 4/5ths of this are (and whether you want it in your pool) it means that you are getting the equivalent of 10 lbs of dichlor for $120. Not much of a deal there.
 
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