A bit of history on this spa. Bought it used, but in really great shape. First filled it and balanced chemicals. Seemed to have a hard time keeping enough chlorine in it and got to looking at the chemicals the previous owner used...biguanides. I then did a full spa decontamination (per instructions I've found referenced on here). Refilled and balanced, using full BBB method. Did the spa refill on May 20th and water has been crystal clear since, no issues. We use it quite a bit, nearly daily and I am very diligent about testing and balancing. My typical routine is to add about 4 oz. bleach when I get home from work, use the tub and then add 4 or 5 more oz after use. I last added chlorine and checked balance on June 6th. Today, June 8th, I open and am horrified to find really cloudy water AND it kinda stinks. I am assuming this must be organic contamination of some kinda, but am at a loss as to why or what.
Readings today AFTER adding 6 oz. of 6% bleach at about 6 PM, readings taken at 9:30 PM:
CH: 130 (reading taken on 6/6 and have since added 3 more oz. of CH+)
TA: 60 (reading taken on 6/3)
Temp: 101 F
FYI, the filter is a 2-stage and was in good shape on last refill, but I think we have a lot of iron in the water (well water) and the filter almost immediately turned rusty colored. Tonight, I replaced both with brand new ones, so will see if that helps at all. Thanks for any assistance offered!