I once asked Jack how he shocks his hot tub, and he said, and I quote “I take off my towel – that really shocks my hot tub!”
Cloudy spa water immediately after shocking your spa is almost considered normal – there’s a lot of chemical reactions going on! But, clear water should return to a spa within a few hours.
However, when adding just ounces of a spa shock makes the water cloudy, there are other things going on; here’s a few places to look for the cause(s) of cloudy hot tub water after shocking.
Swimming Pool Shock
Using pool shock will almost always make your spa or hot tub cloudy. It’s not as fine or re-fined, meaning the particles are much larger, and they don’t dissolve right away. It also is loaded with calcium, which can be a problem if you’re in a hard water part of the country. If you want to use chlorine shock, use Spa 56 chlorinating compound, especially formulated for hot tubs, but don’t use pool shock in a spa or hot tub.
High pH & Alkalinity
Before you shock a spa, it’s always best to check your pH and Alkalinity. Especially if you shock after using the spa; adding a few sweaty bodies into your hot tub definitely spikes the pH with higher alkalinity levels, and a strong shock treatment can knock carbonates and bicarbonates out of solution, making spa water cloudy. Keep some spa pH decreaser on hand, you can use it for lowering both pH and alkalinity.
Hard Water Hot Tub
My water comes out of the tap here at 450 ppm of Calcium Hardness, which is high but not as high as some people in nearby desert areas or on a well. When your spa water is hard, that means it has a lot of dissolved calcium in it. Spas and hot tubs operate best around 200 ppm, and when there is more than that – it can come out of solution as visible scale. Especially if your spa pH is high, and you also have high calcium hardness, shocking the spa can make the water cloudy. To prevent this problem, fill your spa with water that has gone thru the water softening tanks, or use a Pre-Filter on your garden hose, to reduce total hardness levels.
Lotions & Potions
Once I caught my (ex) boyfriend with 3 smelly soccer friends, sitting in the tub after a Sunday match. After their hour long soak, I went to put the cover back on (uh, yeah…), and the water looked funky, so I added some spa shock and it went cloudy. Why? Because of all of the oils, sweat, dirt and who knows what else they washed into my hot tub (gross).
And ladies, we are also not without blame ~ skin lotions, make-up, hair products, deodorant – it all washes off into the tub. And spa shocks don’t do very well with oily gunk, they have trouble breaking it down and this can turn your hot tub cloudy after shocking. So, keep your spa as clean as possible by showering before using, or at least be fairly clean, and keep your hair up.
I have a ritual before using the spa, which is usually in the evening. First, I spend 20 minutes removing make-up and showering. Then I saunter to the pool deck in my robe and hair wrapped up in a towel, (just like a real spa resort).
And unlike Jack, who says he shocks his spa by disrobing, my spa is shocked after I’ve enjoyed a long leisurely soak. I dip a test strip to double check pH and alkalinity, and shake in 2 capfuls of Zodiac Cense, a non-chlorine spa shock.
Hot Tub Works