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Thread: newbee witht TF test results trying to kill algae

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    Join Date
    May 2008
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    newbee witht TF test results trying to kill algae

    Hello Everyone,

    Read a bit first and then went and bought a TF-100 kit Made my readings last evenings

    FC 2
    CC.5
    TC2.5
    PH7.4
    TA 90
    CH60
    CYA40
    Temp 85Degrees

    It's an 18 by 42 rectangular viny pool 8 foot depth edges are rounded I've been told treat it as 30,000 gallons

    1. Is this right more or less?
    2. I have been fighting returning algae all spring here in Pensacola on the bottom and sides.
    3. In the past I have used Walmart Algaecide sold in Gallon Bottles Walmart no longer sells that type now sells something in a half gallon ..supposed to be twice as strong. Just not working it seems.
    4. I have kept up my chlorine readings to at least 1.5 for the last 45 days
    5. Most of the time it has been 3 or a good deal more ...cheap test kits don't read the higher numbers

    So I'd like to stop using Algaecide ... How long Do I have to keep up a shock level of chlorine to kill the algae once and for all???

    What Should I raise the Chlorine leve too to work effectively and kill it off once and for all and should I be using stright liquid Chlorine or something else???

    Anything else wrong with my thinking, pool chemistry, or my wife??? )
    Smile you might make a difference

    Dan

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    duraleigh's Avatar
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    Re: newbee witht TF test results trying to kill algae

    Hi, Dan,

    Welcome! First of all, you can get rid of the agaecide....you won't need it.

    What you will need to do is bring your FC up around 20ppm or so with lots and lots of liquid chlorine or plain old Clorox. Use JasonLion's calculator and figure how much bleach that'll take based on 30,000 gallons (the 30k makes sense for your pool size)

    Now, it will only be effective if you will HOLD YOUR CHLORINE AT THAT HIGH LEVEL by testing and adding more chlorine as often as you can. 4 times daily is not too much if time will permit.

    It may take a few days but keeping the chlorine steadily around the 20ppm level is the key to success. You'll be killing lot's of algae so it is important that you run the pump 24/7 and backwash/clean your filter if the filter pressure rises by more than 35% or so.

    The smart *ss answer to "how long does it take" is "as long as it takes". It's actually the truth, too. It may be just a day or two or much longer. Most pools clear up in about 4-7 days. You should see a little progress each day. The important ingredient in this process is your persistence.....keep testing and adding bleach.

    Ask lot's of questions. Everyone here will help you get the pool sparkling.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    Butterfly's Avatar
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    Welcome to the forum!

    Your numbers look remarkably good to me......except for your algae issues.

    How long Do I have to keep up a shock level of chlorine to kill the algae once and for all???

    Read all about clearing up the algae in Jason's sticky here: http://www.troublefreepool.com/sticky.php?s=4147

    What Should I raise the Chlorine leve too to work effectively and kill it off once and for all and should I be using stright liquid Chlorine or something else???

    Use Jason's Pool Calculator, link in my sig, to calculate the amount of chlorine/bleach you will need to reach and maintain shock as needed. Yes, liquid chlorine/bleach.....plain, unscented 6% most popular, from grocery stores, Walmart, etc. Or, you can get the stronger liq chlorine from the pool stores. Just make sure you make any adjustment in the Pool Calc.

    You will need about 6 gallons of 6% bleach to reach shock level of 15. And, remember, brush, brush, brush!!!

    The algaecide is probably a waste of money and not needed in a properly sanatized pool

    Already having the TF Test kit puts YOU in control of your pool
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    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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  4. Back To Top    #4

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    newbee with followup questions

    so do I understand that once I rid the pool of algae .. test daily, keep my numbers where they belong,

    **** Keep the FC between 3 and 6 as long as my cya stays at 40 ... I should not have to shock anymore? The 3-6 FC would do the trick of keeping my poll sparkling?

    Those FC numbers seem high based on all the cheap test kits out there ... but I can see that it all is very much related to CYA numbers.

    I bought this home 2 years ago .. tis is my second pool summer starting. where does CYA come from? If you use tabs along with chlorine does it eventually increase CYA?
    Smile you might make a difference

    Dan

  5. Back To Top    #5
    JasonLion's Avatar
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    Yes, if you consistently maintain the correct FC level there will never be any need to shock. The key is consistency.

    There is CYA in trichlor and dichlor. Almost all of the pucks/tablets/sticks sold contain trichlor. Many of the granular "shock" products contain dichlor. You can also get stabilizer/conditioner/cyanuric acid which is pure CYA.

    If you use tablets for chlorine the CYA level will slowly go up through the course of the season. Eventually it will get too high and you will have problems.
    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

  6. Back To Top    #6
    I don't have anything to add, as those who have replied have given you A-1 advice!

    Welcome to TFP!

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

  7. Back To Top    #7

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    Ok I think I got it ... This being Memorial day Weekend I'll have to wait til next weekend to do my shocking ... too many kids swimming this weekend

    Thank you all so much

    God Bless and have a safe and peaceful/happy weekend!
    Smile you might make a difference

    Dan

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