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  1. 3

    Degradation of Cyanuric Acid (CYA)

    There seem suggestions to the contrary. This PDF says: "When testing for cyanuric acid with a melamine-based turbidity test, the most significant interference is water temperature. High temperatures, above 90 °F, can result in readings as much as 15 ppm low. Low temperatures, below 60 °F, can...
  2. 3

    Coverstar UV protectant and chlorine demand

    Thanks to both of you for your replies. I hadn't heard of the tennis ball technique. I take it this is supposed to trap oils floating on the water. Good to know. We've now had 2+ inches of rain in the last day or so and the water on top of the cover appears to be clear. I will recheck my FC...
  3. 3

    Homemade WiFi pump and heater control

    Thanks! I found your project also and it looks awesome. Once you start down the path of using a computer and custom software the options are endless as you have demonstrated! The three relays on the right are just cheap relays. However they aren’t switching any load at all. The only load...
  4. 3

    Coverstar UV protectant and chlorine demand

    I opted to clean and apply protectant to my one-year old Coverstar cover. I used both the Coverstar brand cleaner and protectant. I first cleaned, rinsed, and let dry. Then according to instructions, sprayed and brushed the Coverstar protectant on the cover. The instructions emphasize not to...
  5. 3

    Suggestions on causes of cloudy water

    I posted a thread with a writeup including diagrams and pictures here: https://www.troublefreepool.com/threads/homemade-wifi-pump-and-heater-control.211536/
  6. 3

    Homemade WiFi pump and heater control

    While I was waiting out the winter, longing for days on the pool deck with a cold beverage, I opted to put together a system to manage scheduling of pump cycles in conjunction with operating a gas heater. I run a single-speed 1 HP Pentair pump and a Rheem 206 gas heater. I had a few...
  7. 3

    Degradation of Cyanuric Acid (CYA)

    Question for the chemists: is there a mechanism to break down CYA with potassium monopersulfate, which is, as you know, the strong oxidizer in ”chlorine free shock”? I recently saw CYA loss of maybe around 20-30 ppm over the span of around 3 weeks. This seemed high given discussion here...
  8. 3

    Pool Math log suggestion: add anticipated effects to chemical addition log entry

    It would be nice if the log entry for a chemical addition in Pool Math also included the anticipated effects. This information is available elsewhere in the app, but having it in the log would be helpful. I would like to say look at the log and see FC level in morning from test, anticipated...
  9. 3

    Suggestions on causes of cloudy water

    I've found a good way to judge is to look at the light at night. You can even take photos for the record. To do so, stand just behind the wall that the light is on so that the light itself is not visible, but you could see any halo or glow that is a few inches directly in front of the light...
  10. 3

    Suggestions on causes of cloudy water

    I should amend my note above: *inexpensive* off the shelf switches won't easily work. I understand there are full control systems that are built just for pools. However, I don't have water features, or a built in spa or anything. I was looking for two main features: (1) ability to manage...
  11. 3

    Suggestions on causes of cloudy water

    Recently, I've been running the pump 24/7, and all last year I ran 24/7. I've had the pool for just over a year and last year I was focused on a lot of other things related to it (landscaping, new patio, new lawn to replace the mud pit created by construction, etc.) and decided to defer...
  12. 3

    Suggestions on causes of cloudy water

    An update: I continued on with CYA at 50 ppm. Chlorine use was acceptable but water, while OK, was still not crystal clear. I knew I had it clearer last year. Unfortunately a controlled experiment is hard - what happened next was unexpected. I opted to clean and apply UV protectant (an...
  13. 3

    Suggestions on causes of cloudy water

    Good to know. I don’t think it changes my conclusion. I actually did the test first exactly as you describe with the vial in the shade of my body. That photo with the vial filled to the 30 ppm level is attached. When I keep my back to the sun, but move the vial out of the shade of my body...
  14. 3

    Suggestions on causes of cloudy water

    Thanks for the great discussion on here. I think I'm starting to understand my situation a bit more. To reply to some other comments above: I'm still running the S200 and I don't have evidence that there is debris on the bottom getting stirred up. I did switch to the ultra fine cartridge...
  15. 3

    Suggestions on causes of cloudy water

    Cool - let me know and we can compare notes. I had no trouble with the overnight loss test at SLAM levels, so I’m fairly sure I eliminated organics prior to observing those losses. Bather load wasn’t too heavy either. My goal is to get to a point where I can reduce the run time of my pump and...
  16. 3

    Suggestions on causes of cloudy water

    After the SLAM, I tried to keep FC around 8 ppm for a week with the cover open all day most days. When the pool was open, I was adding 70-90 oz of 10% which is an FC loss around 6 ppm a day. Water kept clear. One day FC dropped to 2 ppm during peak afternoon sun and the pool started to get a...
  17. 3

    Suggestions on causes of cloudy water

    An update: the pool was clearer at the end of the first day of the SLAM. I've been keeping the cover open from early morning until at or after sunset. At the end of day 1: FC = 21.5 ppm and the start of day 2 FC = 19.5 ppm. I raised back to 20 ppm. On day 2 at 1:00 PM it was 17 ppm...
  18. 3

    Suggestions on causes of cloudy water

    Thanks for the advice. I'll SLAM again. The pool is mostly clear -- photo attached with some junk in the bottom to help judge clarity. I lowered the pH to 7.2 and then added enough liquid chlorine to bring the FC up to 20 ppm. I'll keep the cover open and test in about 4 hours and then try...
  19. 3

    Suggestions on causes of cloudy water

    At this point in the season the pool is mainly covered. I was able to SLAM and obtain crystal clear water without ever opening the cover. I‘m unsure how the cover affects things. No UV on the pool means no breakdown of CC and gasses can’t escape? But also FC is not broken down and algae...
  20. 3

    Suggestions on causes of cloudy water

    Thanks both - Pool Math shows a CSI of about -0.2. My understanding is this pretty far from where one would expect Ca to precipitate. CH has always been high, but I’ve tried to manage the CSI appropriately. When I first started maintaining/testing the pool last year CH was about 800 ppm, and...
  21. 3

    Suggestions on causes of cloudy water

    Hi all, First, thanks to this community. This is my first post, but I've learned a lot reading many of the threads. And now, I will post to ask for some advice. First I'm sure you'll want to know these numbers (all from the Taylor series of test kits): recently FC: 4-8 ppm range, CC < 0.5...