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Thanks Chem-G...It seems to be a function of when I use the blower. Cranked-up the blower for quite awhile and was not running the pump...then applied so bleach and let it work this area...then turned on the pump...ran for circulation purposes...then tossed in the QC-Shark and ran it for 2 hrs...

My fault for not clarifying. The spa is connected to the pool and when in POOL & FILTER mode, the spa spillover goes into the pool. This "funk" has not been seen when operating the pool & spa in the spillover manner. In fact, when I changed from POOL to SPA mode, turned on THE HEATER, I came...

Hello to All, First time I have posted in the spa forum. We have pool service but I am starting to learn the chemistry here and doing testing w my TF-100 kit. Our pool was filled w water in late Jan 2015...have a large spa [800 gal] w 8 jets & blower. Have not used the spa but only about 3-4...