Quote Originally Posted by essikr View Post
The level I'm reading with my K-2006 test kit says the chlor level was at 5ppm after adding 10 gallons. This what I have added so far.The water is clear and looks just fine.
2 gallons = trace
4 gallons = .5
8 gallons = 4.0
10 gallons = 5.0 that's what is testing at this morning using the kit with the DPD powder with a 10ml sample it took 10 drops fas-dpd titrating reagent to be clear.
Is there anyway to test the actual strength of the liquid chlorine? The jug says extreme pool shock available chlorine 15% ,sodium hypochlorite 12.5%,inert ingredients 87.5%.
You pretty much did a test that indicates your "extreme pool shock" is anything but -- it probably cooked off this summer in somebody's warehouse.

It is possible that something else is happening, however. Do this:

1. Add 4 gallons of freshly purchased PLAIN 6% Walmart bleach in the evening. Make sure the pump is running.
2. Test for BOTH free chlorine and combined chlorine after 30 minutes.
3. Test for BOTH free chlorine and combined chlorine again, in the morning.

Also, test for CYA in the morning, and tell us how that reading compares to what you had seen earlier this summer.