Recent content by brendio

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    testing CYA with turbidity tester

    You could try making your own if you have decent jewellery scales. 0.1 g CYA in 1 L will give a 100 ppm standard. One problem is the difficulty dissolving the stuff. I have found heating the solution in the microwave helps.
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    Struggling to Keep pH Down (AUS)

    You need to do your own testing! pH and TA change with aeration and acid additions, but CH will only change slowly if water is lost and new water with different CH added. A reduction of 65% in CH without changing your water is impossible. So this points to a problem with testing. But you are not...
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    Tiny white flakes in Pool

    I second TS that the white flakes are calcium salt precipitated out from you SWG cell, and the culprit is your CSI ratio being too high. When I see them in my pool, it is an indication that I become slack in my testing the pH has drifted too high and it's time to test and add acid.
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    Zodiac EI Expert SWG cell (Australia) - how to disassemble

    Thanks for the question. Yes, I removed the cell from the pipework and unscrewed the threaded ring on the end where the wires attach. I was hoping to remove the actual plates from the cell to clean the scaling off physically. As you see in the photos, the electrode assembly slides about an inch...
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    Zodiac EI Expert SWG cell (Australia) - how to disassemble

    So, I got lazy monitoring my pH over winter (new baby in the family had me distracted) and I got a bit of scale in my SWCG cell. It's a Zodiac Ei Expert Mid. I removed the couplings from the pipes and unscrewed the end cap, but could only slide the cell out about an inch and half before the...
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    Chemical Disaster -

    It looks like you are in good hands now and on the way to getting the pool back in balance. I can't help myself doing some theoretical forensic chemistry on the situation. Mods, feel free to move this to the deep end if you feel it is off topic. My guess, like others have suggested is that your...
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    New Start Up

    It sounds like you are all over it. I also would have been concerned with leaving the water at FC=0 for a week. Once you have the hang of things, there will generally be no need to test after adding chemicals, but it can be useful if you aren't sure of your volume, or if there may be algae in...
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    Very high pH damage, does it happen fast?

    I think the "hack" you may be referring to is for doing the pH test at FC>10. High FC reacts with the indicator. Diluting will reduce the FC to allow the indicator to read correctly. Distilled or DI water has a low pH buffering capacity so doesn't affect the pH too much when you dilute it (so...
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    UK SLAM FC level measuring

    I wonder how it would go using the kit in the video and using a 100 mL sample, so that each drop equals 1 ppm. The colour would be lighter and perhaps harder to detect could be a problem.
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    Topping off pool during boil water advisory?

    My quick internet search found a link that says it "takes several days to kill cryptosporidium at normal chlorine levels". It is quicker at higher levels. Not very precise, but if it is going to be weeks before you will swim (because of the cold), I think you should be okay.
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    Is Hyclor 4 in 1 test kit rebranded Taylor kit?

    According to random SDS I found online, pH of 12.5% liquid pool chlorine is 12-13. It will have some influence. I'm too tired to do the maths to see whether it is significant on the scale you are adding. Way to check would be to do the same experiments measuring with a pH meter and with...
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    Is Hyclor 4 in 1 test kit rebranded Taylor kit?

    I am saying that addition of chlorine affects the pH value. Bleach is generally basic, so will raise the pH. This influence is separate from the affect of chlorine on the colour developed by phenol red when testing for pH.
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    Is Hyclor 4 in 1 test kit rebranded Taylor kit?

    You need to remember that your added chlorine can be affecting the pH too regardless of test method.