Recent content by calinb

  1. calinb

    Turning the SWG off during SLAM

    My Core35 SWG simply plugs into a 110 VAC GFCI outlet so I put a wall timer in the outlet to insure it only comes on when the pump timer is set to run the pump (a safety precaution in case the Core35 water flow switch fails). So it's really easy for me to manage the SWG, with or without the pump...
  2. calinb

    Turning the SWG off during SLAM

    For a SLAM, I don't think that precisely quantifying chlorine demand really matters much, except at night when you elect to do an OCLT (and then your turn-off the SWG and eliminate all other sources too). During a SLAM, you must only keep up with demand but I don't see any reason to precisely...
  3. calinb

    Jacks Magic Stain Solution 2 Recovery

    Okay guys. My CC is finally back to zero! It's been nearly 10 months since I started the treatment. I checked it last night and again this AM and it's zero. It fell fast (relatively) once the sun came out and water warmed-up. The water is about 84 F now. We had cloudy, weather and a cool and...
  4. calinb

    Algae getting worse early in SLAM?

    Hey Texas Splash, How about a trichlor puck test on the steps too? I've never had organic staining but seems like yellowish stains could easily be organic (not that color is all that great of a diagnostic aid for stains in general, IMHO).
  5. calinb

    Jacks Magic Stain Solution 2 Recovery

    It's getting there (CC continues to drop), but I started the treatment 10 months ago! I used 20 lbs of sulfamic acid / #2 in a 17,500 gal. pool instead of the recommended 17.5 lbs so my dosage was a little high, but not that much higher than recommended so I don't think that's my problem. My...
  6. calinb

    Turning the SWG off during SLAM

    Until I'm ready to do an OCLT, I only need to now if I'm adding Cl fast enough to keep up with demand and maintain the target SLAM level. Even if I'm adding some or all of the Cl with my SWG, I can tell if I'm keeping up with demand and that's all I need to know. In fact, continued testing, even...
  7. calinb

    Trichlor and Liquid Chlorine experiment!?

    Yeah--I think mknauss has reported somewhere how much CYA he loses in sunny Laughlin, NV. It's not completely insignificant, as I recall. The first two seasons that I opened my pool here in Idaho, I had the opposite problem. Winter consumed ALL my CYA. This season was different--maybe because...
  8. calinb

    Turning the SWG off during SLAM

    Your second point is the one that matters to me, though I can always turn it off when I feel I'm ready to do a OCLT. Wear and tear though? Yup--it costs ya' (and electricity too) but, according to my calculations, bleach costs more--especially during these panic-demic times!
  9. calinb

    Jacks Magic Stain Solution 2 Recovery

    I ran the Jack's #2 treatment for about 10 weeks late last season. Then I balanced and closed the pool in December but had zero FC in testing. (Tests reported all Cl as combined.) I opened to a green pool about a month and a half ago, which was abnormal. FC is very gradually coming back but it's...
  10. calinb

    Sand filter clean pressure jumped from 12 to 17 psi

    I compared the readings against a second gauge and they agree well so it appears that I've got a partial blockage somewhere. At least the evidence points to it NOT being in the return plumbing! Strangely, the high pressure is not present when reversing the flow through the filter. Multiport...
  11. calinb

    Post stain removal problems

    Stains cannot be reliably identified by their appearance. I recommend doing tests before treatment. If you are contemplating using Metal Magic, here's the MM sponge test procedure: https://www.proteampoolcare.com/images/uploads/MetalMagicSpongeTest.pdf Alternatively, you could use a Jack's...
  12. calinb

    New, proud owner of neglected 50 year old gunite pool

    Please avoid using Photobucket, if possible. I'm a member of many forums that once hosted useful information and howtos that were rendered worthless after Photobucket pulled the plug on free photo hosting for the contributor's images. When I think of the efforts lost by dedicated and diligent...
  13. calinb

    Sand filter clean pressure jumped from 12 to 17 psi

    Thanks for the heads-up, duraleigh. The 0-30 psi scale makes more sense than my current 0-60 unit. Most of these meter specs express error as a fraction of full scale deflection--at least in part. I'll need to order TF-100 refills and other maintenance hardware soon so it'll help to to qualify...
  14. calinb

    Sand filter clean pressure jumped from 12 to 17 psi

    Thanks very much for your prompt reply, duraleigh! The gauge reads zero when the pump is off. I can't discern anything visibly different from before, other than the gauge reading. Gauges are relatively inexpensive so, out of curiosity, I think I'll order another one. Accuracy isn't important but...
  15. calinb

    Sand filter clean pressure jumped from 12 to 17 psi

    Our pool filter has been working hard this year. First, I opened to a green pool. I think it was related to the late season Jack's #2 treatment I did last year and using only Polyquat 60 instead also first shocking with chlorine before closing. I had fears of stain re-deposition with the...