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Thread: When to boost salt cell generator?

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    lafonte98's Avatar
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    When to boost salt cell generator?

    My FC is 8.2ppm and CC is .2ppm. Cell generator is set to 20% output. The pool store tells me to boost weekly. Is this necessary?
    30,000 Gallon Salt water, size (20ft x 26ft x 36ft), depth 3 1/2ft to 8 1/2ft. Plaster bottom with fiberglass kit walls installed in 2012. Pentair Filter (FNSP48) uses D.E. Motor is Pentair WFE-24 / 011517, HP 1.0 Easy Touch control system

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    Richard320's Avatar
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    Re: When to boost salt cell generator?

    Boost is the equivalent of a weekly "shock." If you maintain adequate FC for your CYA level, no, it's not necessary. Ever. What is your CYA level?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: When to boost salt cell generator?

    100% agree, no boost required. I do add a gallon of bleach from time to time. Like before and after a swim party. A gallon adds 4 ppm of FC to my pool instantly.
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    Re: When to boost salt cell generator?

    If we're going to have a bunch of kids swimming, sometimes I put boost on in the morning and turn it off after swimming, adding to the normal chlorine production. For example, turning it on at 10 am and off at 6 pm adds 3 ppm to the 2.5 ppm the SWC would normally make per day. If I forgot to do this, I'd pour in a quart (litre) of bleach which does about the same.

    If I just hit the button on mine and let it reset on its own, it runs at 100% for 24 hours, making an extra 1.1 lbs (500 g) and delivering 11 ppm extra. If I did that weekly, assuming cell life of 440 lbs (200 kg), it would use up the cell in ~3 years instead of ~5 years. So for me, that's a reason not to do it! I've heard the weekly shock recommendation several times, but not backed up with any real reason for 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

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    lafonte98's Avatar
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    Re: When to boost salt cell generator?

    Quote Originally Posted by Richard320 View Post
    Boost is the equivalent of a weekly "shock." If you maintain adequate FC for your CYA level, no, it's not necessary. Ever. What is your CYA level?
    Hello Richard,

    First of all thank you for the information. I did not see a good reason to boost weekly and didn't even think that it would shorten the life of my cell generator. Below are my pool test results.

    Test results from 5/7/2016 K-2006 test kit used

    Water temp 68 degrees

    FC = 8.2ppm on a 25ml sample

    CC = .2ppm

    PH = 7.4

    ALK = 50ppm

    CH = 825

    CYA = 55ppm


    Please let me know what you think.
    30,000 Gallon Salt water, size (20ft x 26ft x 36ft), depth 3 1/2ft to 8 1/2ft. Plaster bottom with fiberglass kit walls installed in 2012. Pentair Filter (FNSP48) uses D.E. Motor is Pentair WFE-24 / 011517, HP 1.0 Easy Touch control system

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    Richard320's Avatar
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    Re: When to boost salt cell generator?

    Quote Originally Posted by lafonte98 View Post
    Hello Richard,

    First of all thank you for the information. I did not see a good reason to boost weekly and didn't even think that it would shorten the life of my cell generator. Below are my pool test results.

    Test results from 5/7/2016 K-2006 test kit used

    Water temp 68 degrees

    FC = 8.2ppm on a 25ml sample

    CC = .2ppm

    PH = 7.4

    ALK = 50ppm

    CH = 825

    CYA = 55ppm


    Please let me know what you think.
    You can dial back the SWG% or lower the amount of time the filter runs, because with 55 CYA, you only need to maintain about 4 FC.

    55 is also a bit low for the CYA with a SWG.

    If you test FC with a 10 ml sample where each drop equals .5 FC, you'll use less of the reagents and still be precise enough. For the powder, one scoop is generally enough. As long as you can see one or two undissolved bits of the powder before you start counting drops, you have enough.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    lafonte98's Avatar
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    Re: When to boost salt cell generator?

    My generator is set to 20% output currently and I haven't boosted in a week and a half now. I am currently running my filter for 23 hours a day. How many hours would you recommend?
    30,000 Gallon Salt water, size (20ft x 26ft x 36ft), depth 3 1/2ft to 8 1/2ft. Plaster bottom with fiberglass kit walls installed in 2012. Pentair Filter (FNSP48) uses D.E. Motor is Pentair WFE-24 / 011517, HP 1.0 Easy Touch control system

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    Richard320's Avatar
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    Re: When to boost salt cell generator?

    Quote Originally Posted by lafonte98 View Post
    My generator is set to 20% output currently and I haven't boosted in a week and a half now. I am currently running my filter for 23 hours a day. How many hours would you recommend?
    I get by with less than 3.

    For you, start with 6 hours of filtering and set the SWG to 40% and see what happens. Pool School - Determine Pump Run Time

    If the water stays clear, you reduce pump time some more. You'll just need to juggle the SWG% a little to find the right setting to keep up with demand. That's why you have your own test kit.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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