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Thread: Slighty higher CH and ability to drop out sediment?

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    Mount Cheaha Alabama
    Posts
    250

    Slighty higher CH and ability to drop out sediment?

    I've been trying to stay away from my Cal-hypo and strictly bleach for sanitizing & SLAM.(10+yrs of pool ownership) - adopting the TFP mindset
    During opening I did shock with Cal-hypo until I had time to get bleach and over the course of two months my CH dropped from ~225 to ~175 through rain/fill & backwashing.

    I noticed my pool always having a slight turbidity, especially after bleach SLAM with DE on my sand filter for weeks.
    Last week I noticed the mustard algae in a couple spots again and lacked bleach to get to mustard algae shock for my CYA of ~30 (this level has always worked for me but I'm removing all metals in another thread http://www.troublefreepool.com/threa...ter-Experiment) and starting to believe a touch of copper may not be a bad thing.

    So I slammed with 73% cal-hypo and had the white cloud I'm used to but my water turned crystal clear and dead algae is settling in the deep end and the transition from shallow end to deep end slope. Passing OCLT at 16FC and 0CC crystal clear water. Pool has been brushed and scrubbed to no end and NO lights.

    Dosed the filter with DE vacuumed backwashed and repeated twice, still seeing fine pockets of dead algae dropping out -haven't had any rain to vacuum to waste - semi drought here.


    Basically the whole situation seems weird this cal-hypo 73% "Refresh Shock" shows no flocculants in MSDS but is working like a floc even with the pump running
    Current readings
    pH disregard
    FC 16
    CC 0
    TA 80-90
    CH225
    CYA 30

    Prior to Cal-hypo addition
    pH 7.3
    FC 8
    CC 0.5
    TA 70-80
    CH 175
    CYA 30
    30k in ground vinyl lined pool surrounded by decking in the woods.
    Hayward sand filter circa mid 80's
    If there is a way to do things less expensively and yield a superior product I am all ears

  2. Back To Top    #2
    needsajet's Avatar
    Join Date
    Jan 2016
    Location
    Sydney, NSW, Australia
    Posts
    3,551

    Re: Slighty higher CH and ability to drop out sediment?

    In your estimation, did you complete the three SLAM criteria (i.e. continued SLAMing until you could see heads or tails of a coin in the deep end), and then take the pool to mustard algae shock level for 24 hours, including sinking all the pool stuff in the water? If so, then maybe just try doing it again while you have the algae on the ropes. You only lose one day of swimming.

    Good luck with it.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

  3. Back To Top    #3

    Join Date
    May 2015
    Location
    Mount Cheaha Alabama
    Posts
    250

    Re: Slighty higher CH and ability to drop out sediment?

    The first slam was back in late June early July and yes all criteria passed. All this past month the water has had a dull opaque appearance, still clear enough to read a quarter but when I view my blue vacuum head in the water it would look more white and I wasn't getting any sediment. After I noticed the mustard algae return boosted FC to 18 for 48hrs and scrubbed everything. After ~24hrs the calcium fully dissolved and water clarity was perfect as opposed to the previous month. The same I'm used to seeing from my past experience using flocculant and now I'm getting fine sediment in certain areas.

    It could be some other environmental factor such as pollen settling out but that doesn't explain water clarity improving
    30k in ground vinyl lined pool surrounded by decking in the woods.
    Hayward sand filter circa mid 80's
    If there is a way to do things less expensively and yield a superior product I am all ears

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