sorry 'bout being impatient. you guys are the best. i think i'm going to vacume to waste blind cuz i think you are right, i probably have a good amount of gunk at the bottom, which would explain alot. with all the rain we are getting around here, as well as the fact that i have a very deep well, the water loss is not an issue. i think we are onto what the real problem is. i've just been wary of vacuming blind, afraid i might suck something up that could clog my pump or filter, but i think it is now becoming apparent that it needs to be done. i will keep you posted. probably will not have time to do so till the weekend, so till then, i'll keep the clorine up and do some more brushing. thanx so very much for your help.