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HI. Thanks. Your first point seems to be the key. If I have bromide salt, chlorine will transform it to bromine. But UV will convert it back to bromide salt. Is that correct? What is the mechanism for Br + UV to Bromide?

Hi. Can anyone resolve an apparent paradox regarding bromine? I read here that bromine cannot be stabilised with CYA in the same way that chlorine can, so it's not advised for external pools with high UV flux. To me that implies that when bromide salt is converted to bromine, it is rapidly lost...

Hi, I am red/green colour-blind. For day-to-day testing of pH, FC, TC, CYA, TA, I use a Lovibond Scuba+ from Tintometer. It seems to have been replaced by the Scuba II, but it uses exactly the same photometric testing methodology. They claim accuracy of +/- 0.2 pH, and it always seems pretty...

For the benefit of anyone in the UK or Europe who's after an FAS-DPD test kit, I thought I'd post an update. I ordered the LaMotte kit (reference no 7514-01) from Sword Scientific in the UK (www.sword-scientific.com). They were fast, helpful and efficient, and dispatched the kit to my home on...

Update: Taylor K-2006: I emailed Horner Xpress, international distributor of Taylor test kits, to clarify whether they are offering the genuine FAS-DPD test, which works up to 50 ppm, and to request a price if it's available in UK/Europe. I received three read receipts, from named individuals...

Update: Looking more closely, I note that the Taylor K-2006 Complete FAS-DPD offered by Horner Xpress only tests FC up to 5ppm. So that doesn't seem to be satisfactory either. Or have I misunderstood?

tim5055: thanks for the reply (but see below). Richard320: Many thanks. I had found this link before. I noticed that it dated from a year or two ago, and it wasn't definitive. Nothing on the Palintest site, for example, seems to test FCL above 10ppm, so I assume they don't offer FAS. Lovibond =...

Hi I've spent some time researching the forum, but I can't find a definitive answer: is there currently a supplier of FAS-DPD test kits in the UK or Europe? For day-to-day testing, I use a Scuba+ from Tintometer (for FC, TC, CYA, pH etc). This seems to give pretty reliable results (though no...

Jason Thanks. Very helpful.

One side wall of my pool is formed of natural stone and concrete (see picture attached, taken while empty). I don't lose water, so it must be pretty well-sealed and watertight. I'm considering switching from liquid chlorine to SWG. Should I worry about corrosion? I'm not worried about the...