Quote Originally Posted by CarlD
I got a reading of 19.5 FC. Then I tested the pool water and got 5.5, indicating that my 12.5% was 14%--I AM dubious that it's stronger, but at least it tells me the 12.5% hasn't started to degrade.

Thanks!
Carl, we have 2 huge tanks of chlorine where I work that get filled weekly to every 10 days...I asked about the strength and they (the company we get it from) told me it is 17-18% when they deliver it so it will be at least 12.5% when we sell it. We sell a LOT of liquid chlorine so I think the stuff we sell is at least 14% when it is sold! We sell a 2.5 gal refill for $3.69. The jugs are under $6 if someone doen't have one for refill so I think we are the best bargain where I live for chlorine.
IF you are really interested in checking the strength Aquachek makes a high range chlorine level test strip that will test up to 60 ppm
http://www.aquachek.com/products.asp?n=1&l=1
and Taylor makes test kits for testing bleach strength
http://www.taylortechnologies.com/pr...D=2&KitID=2190
http://www.taylortechnologies.com/pr...D=2&KitID=2191