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Thread: First time FAS-DPD tester

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    First time FAS-DPD tester

    Got my new FAS-DPD testing kit. Here are the first set of results for the season. Hopefully I did this right....

    FC 6
    CC 4
    pH 7.2
    TA 50
    CH 50
    CYA Did not register (fyi... when the pool store tested the other day it was zero. The FC and CC were also zero. I added 3 of those concentrated Clorox jugs two days ago)

    From what I've read I understand I need to add HTH stabilizer/conditioner to the water via a sock tied near the return. How much do I need? I don't want to buy too much as I gathered from this forum that a high CYA is bad and you don't want to raise the levels too high and then have to fight the battle of constantly having to add more chlorine. Help! What's my next move so I can shock?

    Thanks
    40K, IG vinyl, Hayward Pro Series sand filter (S244T), Hayward chlorine feeder (CL-200), Aquabot Turbo T2 robot

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    cramar's Avatar
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    Re: First time FAS-DPD tester

    PoolCalculator.com is the best thing to use for determining levels, don't know where I'd be without that tool.
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    Mod Squad jblizzle's Avatar
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    Re: First time FAS-DPD tester

    Given the high CC number, you clearly need to go through the shock process.

    I would add about 20-30ppm of CYA to the pool and then start the shock process. According to poolcalculator, that would be 7-10 lbs for your large pool. Then verify the level a week after it dissolves. Assume it is all active when it dissolves to determine your required FC level.
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    Re: First time FAS-DPD tester

    @Jason...what do you mean by assume it is all active when it dissolves?
    40K, IG vinyl, Hayward Pro Series sand filter (S244T), Hayward chlorine feeder (CL-200), Aquabot Turbo T2 robot

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    Mod Squad jblizzle's Avatar
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    Re: First time FAS-DPD tester

    The CYA you add may not show up on a test for a week, but after you put it in the sock and it mostly dissolves, assume your active CYA level is the level you targeted (20-30ppm) ... even though it may not show up on the test yet.
    Jason, TFP Moderator
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    Re: First time FAS-DPD tester

    Got it. One quick question....you suggest adding the stabilizer to start getting the CYA level up. According to Pool School I shouldn't backwash for a week after adding the stabilizer. You also say to start shocking after adding the stabilizer but the Pool School instructions for shocking say we should backwash during shocking....so do I or don't I backwash?

    Also, should I run my filter 24/7 for one day after adding the stabilizer or do I have to run it 24/7 for a whole week while the stabilizer is dissolving?
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    Mod Squad jblizzle's Avatar
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    Re: First time FAS-DPD tester

    If you put the CYA in a sock in front of the return jet, then you do not need to worry about waiting to backwash (do it when the pressure rises 20-25% over your clean pressure).

    Run the pump 24/7 until the shock process is complete.
    Jason, TFP Moderator
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    Re: First time FAS-DPD tester

    Thanks. What shock level am I trying to target? The CYA chart does not show a figure for having no CYA in the water.
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    Mod Squad jblizzle's Avatar
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    Re: First time FAS-DPD tester

    Start at 5ppm or so, but as soon as you add the CYA, bump up to the 10-12ppm in the chart (depending on how much CYA you add)
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    Re: First time FAS-DPD tester

    Which concentrated jugs of Clorox are you referring to specifically?
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    Re: First time FAS-DPD tester

    The standard bleach jug used for laundry. It says concentrated but I can't find anything on the labeling referring to the %. I assume even though it's a bit shy of a gallon (it's 121 fluid oz) that it contains the same 6%. I got three jugs per box at Costco.

    So half the HTH stabilizer is disolved in the pool via the sock by the return. Added the chlorine and will test again in a hour.
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    Mod Squad jblizzle's Avatar
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    Re: First time FAS-DPD tester

    The 121 oz bottles are 8.25%.
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    Re: First time FAS-DPD tester

    Is there anything you guys don't know?
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    Re: First time FAS-DPD tester

    So filter has been running 24/7....water looks clear...and the 8lbs of HTH Stabilizer in the sock by the returns is almost done. My FC is still quite high. I stopped adding drops of reactant after 11 because the water was still pink and I didn't want to waste chemicals. So here are the other test results

    FC high
    pH 7.1 ( I had to add 2 drops of reactant to raise the ph to 7.5 Do I need to raise the pH while I am shocking? If so, and if I am reading this right I need to add about 2.24 lbs of baking soda) Let me knowing I need to do this.
    TA 60ppm
    CH 50 ppm
    CYA waiting to test again at end of week

    So do I just wait for the FC level to come down at this point?
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    Re: First time FAS-DPD tester

    So do I just wait for the FC level to come down at this point?
    You have finished the process when...
    1. Your pool water is sparkling
    2. Your CC's are .5ppm or less
    3. You can hold your FC overnight without losing more than 1ppm.
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    Mod Squad jblizzle's Avatar
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    Re: First time FAS-DPD tester

    11 drops would only be 5.5ppm ... that is not that high. Do the test correctly and buy more reagent when you need it.
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    Re: First time FAS-DPD tester

    Should I be doing the .2ppm test with 25ml of sample water or the .5ppm at the 10ml sample?
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    Mod Squad jblizzle's Avatar
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    Re: First time FAS-DPD tester

    Use 10mL so you use fewer drops.
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    Re: First time FAS-DPD tester

    FC. 6.0
    CC .5
    pH. 7.2
    TA. 60
    CH. 50
    CYA. Waiting till end of week to register level since adding stabilizer

    So my CC is where it needs to be correct? Now I just have to check the overnight FC loss correct to ensure proper shocking. If I'm off track here let me know.
    40K, IG vinyl, Hayward Pro Series sand filter (S244T), Hayward chlorine feeder (CL-200), Aquabot Turbo T2 robot

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    Re: First time FAS-DPD tester

    Assume CYA is in there and start shocking now.
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