Does anyone have any experience with Natural Chemistry Spa Perfect? We are new to owning a hot tub but our local chemical store recommend Spa Perfect a SmartZyme that controls unwanted non living organic contaminants for weekly maintenance. I added it last night and woke up to a yucky tan/light brown gunk all over my hot tub. Prior to adding this my water looked, felt, and smelled normal along with the chemicals being balanced with the chlorine a little high. We did a water change about 2 weeks ago and replaced the filters with new ones at the same time. We also did a spa purge prior to draining it. We have done a purge and drain 2x’s since October. We use it about 2-4 times a week and it’s usally only myself that gets in it. Someone suggested the metals might be high and that’s what’s causing the gunk with the product. I’m at a loss and being a newbie I’m not sure what might be causing the issues. I would have guessed water needed to be changed had we not just done it 2 weeks ago. What’s others experience with this product?