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My thinking it's not the chlorine but the test strips. Yes, chlorine may become a little less potent but not totally impotent. I have chlorine (same stuff) that's almost a year old and I really don't see a difference in readings.
A 350 gallon tub should be reading about 2 PPM at 20 minutes after adding 1 teaspoon, at 3 tablespoons you's probably looking at 10 to 12 PPM chlorine.
I personally don't like test strips so my advice is get rid of them! But if you really want to use them my advice would be buy a cheap test kit to see if something is off - I have done that in the past with my Taylor kit that I thought was off - it wasn't, my readings were correct.
If your test strips are reading correctly (which I doubt) then you do have a problem with something eating up the chlorine in the tub. Just for a reference, I usually have a chlorine residue (very light pink) 36 hours after adding 3 PPM chlorine into the tub. I will say that it seems my water holds chlorine longer than most people - look for a chlorine residue in the AM if you soak at night.
: Thank you for your input....appreciate it.
: Don't your strips come with instructions that interpret the readings?
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