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  1. jimbethesda

    CC lower than FC.

    Also, you want a low CC (.5 or lower). Anything higher and you may have an issue. Test again and see if it’s really over .5
  2. jimbethesda

    Chlorine keeps going back to 0

    This time of year, in your climate, with a CYA of 30, losing 5PPM a day is a little high, but not unheard of. I’m currently losing about 4ppm a day and have a CYA of 80. You should aim for a chlorine level higher. If your min is 2, then bring your chlorine up to at least 7 (I would do 8) so...
  3. jimbethesda

    Pool in Austin - Getting excited about the idea

    Did you measure the salt level of your pool yet? I’m curious
  4. jimbethesda

    Pool in Austin - Getting excited about the idea

    Go measure the salt in your pool and report back
  5. jimbethesda

    The worst article on pool chemistry I’ve ever read.

    Yeah, that one is weird. I think the run your pump twice a day is weird for a different reason. It's weird that she thinks that is enough information to be useful. Twice a day for 5 min each is a lot different than once a day for 8 hours. Does she think a cycle is a set length of time? Is...
  6. jimbethesda

    The worst article on pool chemistry I’ve ever read.

    Is the weird one: "Run your pool pump twice a day."?
  7. jimbethesda

    Is there a go to place to get all chemicals from?

    This is a good question for you as the cheapest/best answer might be to simply not buy them.
  8. jimbethesda

    The worst article on pool chemistry I’ve ever read.

    Whoa. Yeah, not sure where to begin. My favorite was: If you’ve ever heard of Epsom salt baths or bath bombs, you’ve probably also heard of how beneficial salt water is for your muscles. According to Tom Casey, vice president of Anthony & Sylvan Pools, salt’s pain-reducing benefits can be...
  9. jimbethesda

    New Pool Build in Austin (Feedback welcome)

    We decided not to seal it. My wife was concerned it would be too slippery
  10. jimbethesda

    Help me calculate if SWG is big enough for my pool

    Yes. IC60 user here with a 20,000 gallon pool. The cell’s life is rated in number of hours of usage. So, oversized will last longer too. I run my pump 9 hours a day and can generate 4.5 ppm in that time. Bigger gives you more flexibility for (usually) a small bump in price.
  11. jimbethesda

    Help me understand the empirical evidence for pucks

    You’re using the wrong metric. Algae free is not the same as bacteria and virus free. Have they tested for those?
  12. jimbethesda

    Cal-Hypo vs. Dichlor for saltwater pool

    You can use Cal-Hypo or Dichlor shock, but just know they will increase calcium (Cal-Hypo) or CYA (Dichlor) also. If your calcium and /or CYA are low, might be fine. To make money. Their marketing department came up with that tag line, and in at least your case, it worked.
  13. jimbethesda

    High Free Chlorine

    If you haven’t added any, it won’t be any higher. If you haven’t drained any of your pool, it shouldn’t be much lower. The short answer is given a CYA of 70, you can go lower than 8.6. Just follow this chart. https://www.troublefreepool.com/blog/2019/01/18/chlorine-cya-chart/
  14. jimbethesda

    High Free Chlorine

    Ok, good. Still can’t recommend any change to FC until you test. What was it last time you tested?
  15. jimbethesda

    Chlorine demand

    Your target for a CYA of 90 is 10-12 so it NEVER falls below 7. Your target is below the minimum. https://www.troublefreepool.com/blog/2019/01/18/chlorine-cya-chart/ You now likely have the start of an algae outbreak (not to mention your chlorine is likely too low to kill viruses and...
  16. jimbethesda

    Cal-Hypo vs. Dichlor for saltwater pool

    How many gallons is your pool and what model salt chlorine generator do you have?
  17. jimbethesda

    High Free Chlorine

    Hi, and welcome to TFP! How are you testing your water? Pool store and test strips are not accurate. You need a TF-100 or Taylor 2006c test kit. Assuming your value of 8.6 is correct, in order to say if 8.6 is too high, we need to know what your CYA (stabilizer) is. It’s safe to swim up to...
  18. jimbethesda

    CH(Calcium Hardness) keeps creeping up over 400

    You are generating 3.9 PPM of chlorine every day. That does seem “about right” as you say, but you really need to get a good test kit and measure it yourself, making sure you follow this chart. As far as the plaster goes, I’ll defer to others. Not adding cal-hypo regularly will for sure help...
  19. jimbethesda

    CH(Calcium Hardness) keeps creeping up over 400

    How long does the pump run for? That’s the other variable needed to answer your question. Also, your testing will tell you if that’s enough. Why were you “shocking” your pool?
  20. jimbethesda

    CH(Calcium Hardness) keeps creeping up over 400

    With an IC40 and a 9,000 gallon pool, you shouldn’t ever need to add any chlorine to your pool. You’ll only need liquid chlorine if you don’t follow this chart and get algae. https://www.troublefreepool.com/blog/2019/01/18/chlorine-cya-chart/
  21. jimbethesda

    Cost to run spreadsheet

    Ha, ha. True. It doesn’t seem like there is a lot of support for this comparison calculator. I’ll shelve the idea.
  22. jimbethesda

    Cost to run spreadsheet

    Great ideas everyone! I’m thinking of just the cost of chemicals (or creating chemicals-SWCG). Cost of water due to evaporation and pump run times would be the same for both. This is more the cost comparison between methods, so costs for items that would be shared between methods could be...
  23. jimbethesda

    Cost to run spreadsheet

    Anyone develop a cost to run your pool spreadsheet? Pool store (pucks plus weekly shock plus algecide/clarifier vs TFP (liquid chlorine/SWCG & Muriatic acid)? I’m a finance guy and TFP advocate. I’m envisioning this to be a different kind of “pool math” page. The end result is that not only...
  24. jimbethesda

    Salt level in non-SWCG pools

    Wow! Goes to show you PB's concern about "salt" pools are unfounded.
  25. jimbethesda

    Will the Industry Ever Change CYA/FC Parameters?

    I’m very interested in this too. I believe it’s all about the money. Pool chemical manufacturing is a $1 billion industry. Add in the big pool stores margins and pool service company business models. Lots and lots of companies have huge economic incentives (and some entire business models...
  26. jimbethesda

    Salt level in non-SWCG pools

    I was curious to see how high salt levels get in non-SWCG pools. Anyone test their levels either for the heck of it, or because they were going to install a SWCG and wanted a starting value? If so, post your level along with an approximate length of time since initial fill and/or partial...
  27. jimbethesda

    Will the Industry Ever Change CYA/FC Parameters?

    This. Too much money being made using the old method. Lots of $$ in pucks and magic potions. Not to mention the “dump and run” business model of pool service companies.
  28. jimbethesda

    New Pool Build in Austin (Feedback welcome)

    Here are some pictures. This is the stone we got: https://www.patarastone.com/product/savannah-walnut-paver-tumbled-16x24x3-cm/
  29. jimbethesda

    New Pool Build in Austin (Feedback welcome)

    Unfortunately no. Everything went through my PB.
  30. jimbethesda

    Total Chlorine a little higher then Free Chlorine

    Just make sure you don’t let your FC drop below the minimum again