Thanks for that Richard,
It was definitley PH up that I added - but the readings were taken about 4 days apart and I did add some acid in the meantime so maybe this caused the drop in PH?? (or my readings were askew)
We (two of us) generally soak for around 20-30 mins per night and I have tested the FC before getting in and its usually quite low (<1) but the fact that I have ozone and Nature2 I was under the impression that this was about right??
I find the Lithium Hypochlorite dissolves pretty well... After use I dose with 2 Tb (straight in the spa), I leave two of the pumps running for half an hour (they cut-off automatically) with the air turned off and let the 24hr circ pump do the rest.
Only problem is that it's quite expensive, but hey, we didn't buy the spa to save money!!
I've only ever used the Lithium Hypo, not even sure you can get Dichlor in Australia (??) and to be honest I'm not really sure what it is??
Only had my spa about 6 weeks so still running on the first fill - YES I'm a novice!!
Thanks to this forum and contributers such as yourself, I have learnt a lot in a small time (still lots to learn though)
Cheers
By the way - This is the first day under about 33C in about 3 months In my part of the world (Perth, Western Australia) so can't wait to finally have a soak to 'warm-up' rather than just to go from heat to heat (if you know what I mean?!)