What a great site this is! I acquired my first spa a few weeks ago and am very impressed at the quality information I found on this site. I am confident I'll be able to better manage my spa with the expertise found here!
In a nutshell: I have a SPA with a SWG and the pH is unmanageable - always runs high (>8).
I've read elsewhere that this is a common issue with SPA/SWG. I have also carefully read this post on why high CYA is a good thing with SWG and SPAs in particular.
- 350 gallons (1300 liters); T=95F; 2 bathers every odd day;
- The spa is covered when not in use; so affected minimally by sunlight;
- TA: 110 ppm
- pH: 8.1
- CH: 110
- Salt: 800 ppm (ideal 600ppm)
I know this is low compared to most units currently being sold;
The manufacturer no longer exists; this is what I found on their old website;
It does use a Hayward T-Cell-5;
The only function on the control unit is a timer which turns on/off 6 times a day for a duration I can set;
I did clean the cell 10 days ago; and I can measure chlorine being produced;
- TC = 1.5 - 2.0; FC = 1.5 - 2.0;
- CYA: 0
- Borates: 0
I would like to implement CYA & Borates.
I've been using a dry acid to lower pH but will switch to liquid muriatic acid.
My plan is to lower TA to 70 or so, which I am in the process of doing right now.
I use test strips for the time being, and plan to get a Taylor kit in short order.
- Am I ok in setting TA to 70 as a first step?
- Then I will lower pH to 7.5 or so, is that Ok?
- What should I do first: Borates or CYA?
- I would target CYA of 50ppm or so, and/or Borate of 50 ppm; that okay?
- Will the calculator on this site suggest proper quantities in my situation?
- Should I do only one of these two, and monitor for some time (days/weeks) before going ahead with the second?
Any other suggestions will be greatly appreciated!