I bought a house with a pool in a few years ago. I must admit to being a bit lassez-faire with the chemical regime until recently when it went kinda green so now I'm trying to take it more seriously. But - I've been struggling recently to get FC anything above zero and to get the pH under control. I just bought a new Palintest kit and tested it and the results seem pretty extreme...any suggestions?
Firstly - TA is 220 mg/l, CA is 380mg/l and pH refuses to rise above 6.8. That pH sounds low to me although interestingly according to the "Balanced Water Index" calculation in my Palintest kit, that pH is about as expected if you combine it with the TA and CA. Any thoughts? I do live in an extremely hard water area.
Secondly - My FC is zero. Plain zero. However much shock I add to it, I can't get it above zero! After reading your excellent forum I think maybe it's because I've been using Triclor regularly and my CYA is too high. Tested it today and yes, CYA is 120. Do I have any alternative to draining half the pool away and refilling..?
I appreciate any advice.
To complete the details:
- Capacity is 6300 US Gallons (24050 Litres)
- Sand Filter
- In Ground
- Plaster (Tiled)
- Flow Rate - No Idea!
- Age: About ten years, I think. Certainly more than six.