Hello forum
I bought a used hot tub a few weeks ago,
its a UK model 'Blue Whale Spa' 'santa anna' with 3 pumps and a balboa control system, about 4-5 years old.
It appeared to be in good condition - everything working and certainly looks the part.
As it's used I wanted to do a very good job ensuring its clean for its new users (the family).
I bought some 'pro-kleen' hot tub flush and filled the tub, ran it for 30 mins then drained it. There was yellow gunk on top of the foam when it did this.
so I drained it and then cleaned it down inside, then filled the tub and added some shock & chlorine to balance the water.
After a week or two the water was starting to look / smell (wet dog) not ok so I drained the tub and flushed it again, same yellow gunk on the foam, I also cleaned the filter and let it stand in bleach overnight.
I then wanted to be 100% sure it was clean so I added 1/2 gallon (3 litres) of thick bleach and ran the jets for a hour or two. (Possibly overkill)
then drained, then flushed again with the 'pro-kleen' and I am still getting the yellow gunk!
So drained and filled then flushed again - still some gunk on the foam.
Should I be aiming for no yellow gunk when it's flushed? What's others experience with cleaning / flushing the tubs?
Any advice or tips are much appreciated y'all