If this is not correct forum-please move.
I have always been interested since getting my pool, exactly what the % was on the chlorine I buy at "Pinch a Penny", they say it is 10%. They have the best price here. I read of goods ways to test it here but just never did.
This year just thought I would, I'm paying for it, and they tell me I'm getting 10% chlorine. So I used the method described by CRG_80cc, in this thread "Testing strength of liquid chlorine" where he made the statement of you might get "better accuracy if you do two 1:100 serial dilutions of your sample (still gives 1:10,000 dilution)."
I have a TF-100 test kit, so I used it to measure the 100 mls of water, doing 2-40mls, and then 1-20 mls to get right amount. I used 5 ml syringe I got at walgreens for the 1 ml. I'm sure that there is a margin of error here, but I also found that it can be very close (acceptable) if you put the liquid on the line when measuring, in the vials and syringe, like you were in an old chem class
All said and done, I came out with a probably 9.5, and a definite 10 for the chlorine in the jug. I'm on their program of 2 1/2 gal jugs. This is the cheapest way here. Anyway, just thought that someone might be interested, and made me happy in that if my test was even close, I'm getting what I'm paying for.
Thanks for the help TF-100 and on all the other test.