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Thread: Two-part testing question

  1. Back To Top    #1

    Join Date
    Nov 2015
    Ok ok

    Two-part testing question

    For my chlorine drop test, my 0870 reagent appears to have got damp somehow. It is dark colored, although not solidified. I did have some dry reagent left, and when I do the test they seem to yield the same results so I am guessing it is OK to use?

    Second question is, for whatever reason my test tube I use for the chlorine drop test, is turning black on the inside after I run a few tests,. I am able to pour vinegar in it and clean it up but I don't remember doing that before. What causes the black residue inside the plastic tube? It is not easy to remove with just water, vinegar does remove it.

    ~14K gallon - AquaRite AQR15 SWG - pool Newly plastered on April 9 2016
    TF100 kit - STA-RITE SYSTEM3 Modular Media Filtration - Model S8M150
    Pool water supply from on site water well = CH of ~350 and TA of ~350
    Doheny's Discovery Automatic Robotic Cleaner/Pentair Model 011018 VS Pump
    Sundance Altamar Hot tub separate from pool / central Oklahoma

  2. Back To Top    #2
    BoDarville's Avatar
    Join Date
    Jun 2012
    DFW, Texas

    Re: Two-part testing question

    If you are getting the same results with both 0870 reagents, I would continue to use them. I would suggest using the darker-colored one first since its shelf life may have been compromised by getting overly damp.

    As for the test tube residue, it may be due to metals in your fill water - likely since you have a well.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
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