Why is my spa suddenly needing water filled frequently?


Well-known member
Apr 29, 2016
Denver CO
We’ve been having problems with the hot tub in our vacation rental lately . It's almost 4 yrs old and this has never happened previously. The last 3 refills were only 2, 3 and 4 weeks apart .

I don’t service it- we have someone else. I’m wondering what could be causing this. She says it needs changing because it’s stinky , foamy , cloudy , greenish and yet this is our off-season when we don’t have that many people in it.

Using the bather load equation we should be able to go about 1 month in summer and 2 months now in-between.