Wow - a question I can finally help with! lol
We just moved into a new home with a jacuzzi bathtub, and though everything looked very clean, I noticed a little of the same scum stuff the first time I used it, and it just got worse the next 2 times (ewww) ...so I got online to research the problem.
Keep in mind that this house had been empty for 6 months (3 year old home) so the deposits were hardened in the pipes. This procedure had it spic and span...
Until I track down the web page from which I found it - I think it was at kholer.com or something... Here's the basic procedure:
1. Fill tub with hot water to a couple inches above jets.
2. Pour in about a half cup of bleach and a tablespoon of powdered cascade dishwashing detergent
3. Run the jets for 15 minutes with the air knob thing open all the way so it gives the highest turbulence
4. observe gunk and try not to choke 8]
5. empty tub
6. Refill with cold water to above jets
7. Run jets to rinse - 10 minutes
Do this twice a month.
The page had some very informative info about what kind of stuff builds up in those pipes - I'll hunt it down and post it tonight.
Q
Stepping stones with gravel around them. I like the look.
Q