Stockwell Safety
Stockwell Safety
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Flow Rate and Turnover
Views 15310 months ago
pH and free chlorine
Views 14410 months ago
Testing Frequency
Views 5910 months ago
Views 6010 months ago
Outlet Hazards
Views 9810 months ago
Circulation System Overview
Views 26711 months ago
Exclusion Policies
Views 5511 months ago
Sources of Pollution
Views 13411 months ago
Daily Bather Load
Views 8411 months ago
Instantaneous Bather Load
Views 12411 months ago
Relative Pollution
Views 5811 months ago
Views 511 months ago
Calibrating Sensors
Views 128Year ago
Brief Intro
Views 17Year ago
Daily Bathing Load
Views 18Year ago
Hand Dosing Chlorine
Views 199Year ago
Importance of pH
Views 17Year ago


  • Kenneth Fjelde
    Kenneth Fjelde 4 days ago

    How low can the Chlorine be if you had UV ?

    • Kenneth Fjelde
      Kenneth Fjelde 3 days ago

      @Adam Harries Thank you for your answer. So with UV in pool has min level at 0.5 free chlorine? Thanks for informative videos 👍

    • Adam Harries
      Adam Harries 4 days ago

      The recommended chlorine range is 1.00 ppm - 3.00 ppm for pools and 3.00 ppm - 5.00 ppm for spas. With UV at the correct dose, the above parameters can be reduced by 50%.

  • FOX 狐
    FOX 狐 2 months ago

    Then how about hydrocarbon polution ? Something like sugar or oil that contaminating water. The problem is how to detect them because they arent conductor. And just chemicals inside water that have ions can be detected.

    • Stockwell Safety
      Stockwell Safety 2 months ago

      The video is about tds in swimming pools. The basic measurement of tds is sufficient . Additional measurements such as hydrocarbons etc. would provide little additional value.

  • Ithirstyforknowledge
    Ithirstyforknowledge 3 months ago

    Very well explained. Thanks

  • Diego Martinez
    Diego Martinez 3 months ago


  • Bo Brahim
    Bo Brahim 11 months ago

    don't you have to add sodium thiosulphate to deactivate the chlorine when taking the sample for microbial testing?

    • Stockwell Safety
      Stockwell Safety 11 months ago

      Yes. But this video does not describe the method for taking samples for microbial testing. It describes the method for taking samples for chlorine and pH testing.

  • Bo Brahim
    Bo Brahim 11 months ago

    one more request: can u change the title of the video to ease the search for this important issue, say: how to calculate the dosing of Ca hypchlorite in the swimming pool? as this make it easier to find.

  • Bo Brahim
    Bo Brahim 11 months ago

    This is the most informative video I've found on this issue. Thank you very much for the valuable information. I definitely subscribed :)