Roxymonkey

Hi Missouri, thanks for the reply. My water supplier confirmed with me that the fill water should not be that high. I have just cleaned the spa with swirl away and done a new fill. This time the Alk was 150 straight away and the ph was 7.6. After a much less amount of acid the water is now spot on. Conclusion: no idea what made my last fill water go crazy in comparison other than something bad was living in my tub! If in doubt - refill. Thanks for your posts guys.

Ok, that makes more sense than the many websites out there to confuse with different theories! I am using the arctic pure range adjust down which says sodium bisulphate on the bottle but doesn't give the strength. Would it be "normal" to have to add this amount of acid to a fresh fill then?

Hi chem geek, Many thanks for your reply. I am using a palintest comparator with rapid dissolve tablets. Unfortunately I couldn't find the Taylor kit in the UK. Re: Gallons; I should have made it clear, U.S. Gallons are different I believe. 350 Gallons (UK) equate to about 1591 litres. The acid was put into the spa each day 50g at a time and then the next day tested again. For the first 450g there was no change on my test results, it was still at the maximum. (Comparator goes up to 8.2ph and 250 TA mg/l) If my tap water has a TA of 200 max, why did it shoot to double or more when it entered the spa?

Hi all, This is my second fill of this spa since buying it last November. 2 weeks ago I emptied it and filled it straight away with mains tap water. My supply is 7.6 ph and 150 - 200mg/l TA. (Confirmed by my test and water supplier). Once full, I tested the water and both readings were at the top of the scale on my palintest comparator. I added arctic pure adjust down as instructed 50 g at a time. After about 650g (22 ounces) of dry acid later, I now have a TA of 100 and PH of 8.0. I have been told by my spa dealer and Arctic tech guys that this is very unusual and they have no idea why I had to add so much acid. Any ideas anyone as to why I have used so much acid when my water supply is ideal ? Spa - Coyote Maricopa by Arctic Size - 1500 litres / 350 Gallons Many thanks, Paul