Forgot to mention nothing is slimmy & the bottom is not slick at all. On Saturday morning i had 15.5 from 16 the nite before. Vacumed very carefully so not to put anything back into the water & gave it it's winter dose of polly so i had time to get the chloride back up. On Sunday had a few deposits in the cracks, vacumed them & stayed on top of the chlorine. This morning virtually had no deposits, chlorine was back up to par, did a quick vacume, dropped the water level, pluged & capped & put the coner on it. I have never had any problems with metals, i guess i'll find ou next spring. Thanks again for your help, i have never had anything like this happen & your system works great.