Re: liquid chlorine versus powder
1 gal of 12.5% liquid chlorine raises 10000 gallons of water about 12 ppm
1 gal of 6% liquid chlorine (or laundry bleach) raises 10000 gallons of water about 6 ppm
1 lb of 48% cal hypo (the most common strength that is sold as pool shock in 1 lb bags these days, the stronger stuff is getting hard to fnd since it is a class III oxidizer) raises 1000 gallons by about 5 ppm
lb of 65% cal hypo ( getting hard to fnd since it is a class III oxidizer) raises 1000 gallons by about 7.5 ppm
1 lb of 73% cal hypo (A strength that I have not seen in several years!!!) raises 1000 gallons by about 8 ppm
IF you compare the costs:
a gallon of pool chlorine in my area is about $2 ==>best value
A gallon of laundry bleach is about 1.50 ==> second best value
A 1 lb bag of 48% cal hypo is $4-$6 ==> expensive!
A 1 lb bag of 65% cal hypo is $4-$6 ==> expensive!
73% cal hypo does not seem to be available anymore in my area,
YMMV since there are regional price variations.
Retired pool store and commercial pool maintenance guy.
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