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Thread: I just finished treating an algae bloom

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    I just finished treating an algae bloom

    My first post...I just finished treating an algae bloom. Started treating Fri(15) and pool is now all blue Sun (17). I used Dolphin cleaner first to remone bloom on floor and walls. Cleaned about 90% after two passes. I then added 6 lbs cal hypo (FRI) and measured FC (6 hrs later) was 28 ppm using DPD-FAS.
    This is first algae bloom I've had this year probably because of drought. When rains (daily) started last week algae started and daily afternoon showers washed algae from a large live oak tree that covers the shallow half of my 20X40 foot inground pool. I did super shock with low (7.0) pH to enhance chlorine efficacy.
    My do I prevent algae growth under above conditions and keep FC low enough for swimmer safety? No! Cutting tree not an option. More use of PolyQuat maybe?
    14,500 gallon in-ground (pebble-tec) pool with Turbo-Clean system in Sierra Vista, Arizona with attached spa
    Pump: Sta-Rite Max-E-Pro (Model P6E6F-207L) 1 1/2 HP, 3450 RPM
    Filter: cartridge, Sta-Rite Stystem3 Modular Media Filter (Model S7M120), max. flow rate 100 gpm, Filtration rate 0.33 gpm/sqft.
    Heater: Sta-Rite 1 1/2 hp SR Pool and Spa Heater (Gas) (Model SR400NA), Input Rating 399,999 BTU/hr, 117,2 kw

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: I just finished treating an algae bloom

    Welcome to TFP!

    You should follow the FC level recommendations in the Chlorine/CYA chart to find the appropriate FC level for your CYA level. FC levels between "Minimum FC" and "Target FC" are totally fine, and most people will swim any time FC is below "Shock FC".

    There is no need to lower the PH when shocking if you have any CYA in the water. CYA changes the chlorine/PH relationship and makes the PH essentially irrelevant (as long as it is generally in range).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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