I have a Hayward Chlorinator that I put Leslie's Chlorine tabs in. Of late the FC levels have been going to Zero, no matter what setting I have the chlorinator at. Earlier in the season it was 5 and above all the time and I couldn't get it lower...so who knows what's happening. While I'm trying to figure that out, what's the worst that can happen if I put the tabs in say an old pair of nylons and put in the skimmer basket?