I brought a house late last year that had a swim spa. First time owning a spa and have never owned a pool. So it's been a big learning curve. It's taken a while, but we have finally found the right mix of chemicals that works for our family. The spa stays pretty clear, and I take it to the pool shop to be tested once a fortnight. And it's remaining pretty balanced.
My issue is that it has a lot of oil over the top of the spa. This is the second time it has done this, and it's very frustrating. Water here is incredibly expensive. So I can't dump the water every time it gets oily. But this is the timeline so far.
House was brought with spa empty, but dirty with leaf matter ect and a little bit of dirty rain water as there were no covers on it.
Picked up rubbish from inside spa. Water-blasted out the spa, scrubbed to remove any buildup with cleaners. Replaced disgusting filters and replaced with brand new. Water-blasted the spa again, quarter filled and emptied to drain any sudsy water.
Filled spa, shocked and allowed to heat. Maintained for 3 months with bromine system. Water started getting really foamy. Was unaware of the oils on the top but I'm certain looking back that they were there. Put through a clarifier which made the yucky green foam that could be scooped up. But we weren't required to empty the spa. It was right for another month.
Got foamy again (like dishwashing liquid in the pool) and run the clarifier through again. This time it didn't work so well, and the foam stayed. It's about now that we noticed the oils. The more oils there was, the foamier it got. But was unable to scoop the oils up. We lasted a few more weeks with the foam.
Finally got sick of the foam, so ran a full degreaser through the spa and pipes and emptied. Scrubbed it out as per the instructions on the degreaser/spa cleaner. Flushed all the pipes with a hose, refilled. (Refill done with half tank water, half town water)
Shocked spa again, heated. Spa looks clear and no oils present on the surface. It maintains it clarity for about a month before the oils start coming back. It's originally very hard to see, but it's slowly getting worse and worse. Last night we had a slightly more foamy spa then usual, with the bubbles being hard to dissipate. It was only refilled 2 months ago.
We brought a scum bug, but it's not really working.
We think my partner is the culprit as he works in a workshop and is very sweaty. I've mentioned that he might need to have a shower before getting in, but he forgets.
Is there anything I can do to remove the oils and eventually the foam without emptying the spa again?
-5900 litre swim spa
-Heated to 37 degrees celsius year round.
-Spa about 5 years old
-Automatically filters for 6 hours a day (via solar panels) and also at night whenever we use it
-Usage anywhere from 2-4 times a week
-Nature2 mineral sanitiser
-Aqua Health Ultra Shock (non chlorine based shock) dosed 2x weekly
-Lithium Hypochlorite dosed at each spa usage
-Chemical balancing approx fortnightly/monthly depending on spa clarity