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I have the same test kit, I think (ColorQ Pro7) but I have done some tests, which show that the results are not as reliable as you might expect. The size of the 5 drops can affect the result significantly (do you put them in holding the bottle horizontal or vertical?), and if you accidentally...

If I move to a SWCG, would I have to drain the pool completely and fill with fresh water, or could I just change over to a SWCG with the existing water (assuming that I had got everything under control by then, and had clear water again, with good TA and CY levels)?

Thanks frogabog. I have found some liquid chlorine (sodium hypochlorite) at 15% online, so have ordered that, and will use that from now on, whilst I look for a suitable SWCG. I do have a proper test kit now - a LaMotte ColorQ Pro7.

Thanks, I have a sand filter. I’ll look into getting a SWCG. Strangely, not many models seem to be sold in the UK. It’s a very US thing.

I have been maintaining my own small pool for 43 years with just a FC and pH test kit, using just stabilised chlorine with added algaeside and clarifier, and a 3-monthly dose of “long life algaeside”, without any issues, and constant crystal clear water, but recently my 8,000 gallon pool got out...