I have just bought an Intex 15' x 42" above ground metal pool. I have shocked it twice and took a water sample to Leslie's Pool Supply and was told everything was fine except I had no chlorine and they told me to buy a floating chlorinator. I punched out 2 of the bottom holes on each side and added 7 of the 1" inch tablets like they said and 5 hours later I am still getting a zero reading when I test it with the strips. How long does it usually take for the chlorine to set in the pool? I am also in very hot Houston Texas but my water temp is cool.