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Thread: Saving R-0871

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    Saving R-0871

    Well I searched several threads but I just want to make sure I got this correct:

    In order to save a little R-0871 reagent, I can use 5 ml of pool water and 5 ml of distilled water (to total 10 ml). If I do this, then however many drops I add is my actual PPM chlorine, is that correct?

    For example, I added 14 drops before it went clear so my FC is 14? (as opposed to 7 if I had used 10 ml of pool water)

    (I know it's not quite as accurate, just trying to save a little until my order of more comes in)
    15,000 gallon free form Viking fiberglass pool. Hayward Star-Clear Plus C12002 cartridge filter. Hayward Swim Pure Plus T-15 SWG. Testing with TF-100 Kit. 2 speed 1.5HP Supreme pump. Dolphin Nautilus robotic cleaner

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    Re: Saving R-0871

    That is correct. But you really don't need to do the dilution, you can just do the 5ml and each drop is 1 ppm
    You just need to take great care with the meniscus. Or have a very good way to accurately measure a 5ml sample of pool water.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Saving R-0871

    Quote Originally Posted by pabeader View Post
    That is correct. But you really don't need to do the dilution, you can just do the 5ml and each drop is 1 ppm
    You just need to take great care with the meniscus. Or have a very good way to accurately measure a 5ml sample of pool water.
    Thanks Pa, great advice as usual! I think I might use a small syringe to get exact 5ml
    15,000 gallon free form Viking fiberglass pool. Hayward Star-Clear Plus C12002 cartridge filter. Hayward Swim Pure Plus T-15 SWG. Testing with TF-100 Kit. 2 speed 1.5HP Supreme pump. Dolphin Nautilus robotic cleaner

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    Re: Saving R-0871

    Syringe is a good idea - I use one (left over from some children's liquid meds) for all test samples - 5 ml, 10 ml, 25 ml, whatever. Much more controllable and accurate than trying to get the meniscus exactly in the right place.

    And, as stated, no need to dilute your 5 ml sample with distilled water - that would be an unnecessary extra step.
    18' x 48" ring top pool (Summer Escapes); 5500 gallons; set up June - October, stored during winter; Intex 2500 gph pump (B size cartridge filter) Hayward 21" sand filter + 1.5 hp single speed Powerflo Matrix pump (upgrade October 2016) *** K-2006 test kit, refills from tftestkits

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    Re: Saving R-0871

    I only thought the meniscus was relevant in the daily chlorine and PH, two cylinder tester?
    Mark
    20'x28' IG, Vinyl, (Sept 2015) 14,900 Gallon, 3'4 to 5'6 deep, SPLAPOOL 1.5 HP, 220v, 2 speed pump, Waterway Carefree 27" 400 LB Sand filter, Digital Nano plus SWG, TF-100 test kit /speed stir. Dolphin Primal x3 robotic cleaner

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    Mod Squad jblizzle's Avatar
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    Re: Saving R-0871

    The bottom of the meniscus is always the important level.
    Jason, TFP Moderator
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    Re: Saving R-0871

    Quote Originally Posted by kywildcats View Post
    I only thought the meniscus was relevant in the daily chlorine and PH, two cylinder tester?
    The quantity of water you use matters in all the tests; the more repeatable your water measurements are from test to test, the more reliable your results. "Meniscus" is just a word for the top surface of the column of water in its container, so that's always what you're looking at when you check if you have the proper quantity of water in your testing container.

    Come to think of it, I use the syringe for direct measurement of 5 ml and 10 ml samples; for larger samples (CH and TA tests) I watch the meniscus while using the syringe to slowly add the last bit of water to reach the desired level - much slower and more controllable than just pouring the water into the testing container.
    18' x 48" ring top pool (Summer Escapes); 5500 gallons; set up June - October, stored during winter; Intex 2500 gph pump (B size cartridge filter) Hayward 21" sand filter + 1.5 hp single speed Powerflo Matrix pump (upgrade October 2016) *** K-2006 test kit, refills from tftestkits

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    Re: Saving R-0871

    Purests would say this; "Sample must be measured with the meniscus at eye level (to eliminate parallax error) and at the center of the meniscus, i.e. the top of a convex meniscus or the bottom of a concave meniscus."
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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