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Wow! It decreases in potency quite a lot quicker than I anticipated, even when kept inside in 75F environment. I will take back the 3x unused 3 packs then.

Ok, cool! Thanks again. I have wayyy too much bleach now haha. Only used 2 of the 12 gallons I bought. Used the bulk discount at Home Depot. It will last a while if I keep it inside the house and in a closet, right?

Here are the results from last night and this morning: Before starting the SLAM, pH was at 7.8 and FC was at 3. I added muriatic acid to bring it down to 7.2 and then an hour or so later added the cholorine. 2000 hrs: FC was 19 ppm with the 5mL testing - so not as accurate. May have...

Ah, ok. Thanks for the tip on the CYA being 40, not 34. Will go with the higher SLAM FC of 16 then. Better safe than sorry! Is there a way to perform the FC test using less reagent - for example, can I use 5 mL of pool water instead of 10 and then use a 1:1 ratio with the drops instead of...

Hi, yes, I have had the TF-100 for a few weeks. All test results were performed with the TF-100. I haven't been to the pool store in weeks!

Last night we performed our first OCLT after draining and refilling the pool on Saturday. Yesterday afternoon I checked the FC and it was low at 2.5 ppm. I added Cl and checked again at about 11 PM and it was 5.5 ppm. This morning, we were down to FC 4.0. CC for all the tests since the re-fill...