I've been operating our tub since autumn 2011, and at first all was well.
I followed Jacuzzi Calgary's suggested chemical regime:
Add chlorine when levels get low through the week
Each weekend, add 'Foundation', 'Shock', 'Super Clarifier' and 'Secure'
Every other week, add 'Spa Perfect'.
Adjust for pH / TA as necessary.
The chlorine level would stay stable, going down slowly over a matter of days.
Then, they came and fitted a 'Clear-Ray' UV lamp, but removed my ozonator (I was out so I didn't see them do this).
Ever since, my chlorine just vanishes.
I get a reading of 0, I add 4 tablespoons of stabilised chlorine, and 24hrs later, it's at 0 again! (No use in between).
I eventually replaced the 'Clear-Ray' with a Delta UV lamp (much bigger and up to the job) and refitted a new ozonator.
(The back pressure of the Delta UV seems to be slowing down the ozonator water circuit, so I'm not sure if the venturi is sucking the ozone effectively).
However, I'm still experiencing the vanishing chlorine.
I've tried Super-chlorination, then Super-Super-chlorination (suggested by Jacuzzi Calgary), but even using a whole 2kg tub of chlorine made no difference!
Just how fast is chlorine meant to disappear in a normally-operating tub?
I've thought of switching to a salt-water chlorine generating system, so I'd never run out of chlorine, but if there's something wrong with my tub, then I feel I should identify it and get it fixed instead of adding another level of complexity that may not fix the issue.
What could be making my chlorine vanish so quickly?
Any ideas would be greatly appreciated.
Jacuzzi J480 (2007) 1700 litres, ozonator, Delta UV lamp