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Thread: Newbie Green Algae

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    Newbie Green Algae

    Hi Everyone! I am new to this forum and new to maintaining pools. I live in South Mississippi and I hope not to ask too many 'basic' questions. I have been reading over all info posted on basic pool chemistry and the correct way to ask a question. Please bear with me!

    Q1. My pool is green! The pump has not run for at least a month now. I saw the section on getting rid of the algae and that I need test results before I begin. Do I just take a sample from the standing pool water or is it better to run the pump and then get the water sample for my local pool store? I am sure there are no chemicals in the pool.

    Q2. My Hayward Sand Pump Filter's pressure gauge is busted. Can I just unscrew it and replace it with a new gauge?

    I have no further questions right now, but I need lots of help. Thank you in advance for your patience everyone!
    20,000 Gallon, Vinyl Liner
    Hayward Sand Filter
    South Mississippi

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    Richard320's Avatar
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    Re: Newbie Green Algae

    First, order up a proper test kit.

    Then replace the pressure gauge. Yes, it just unscrews, it's standard pipe threads. Use teflon tape like you would with any plumbing repair. Do not overtighten it or you may crack the filter housing.

    I would get the water circulating some before testing. Even just an hour with a little brushing will do it. If you have had any rain, you may have some stratification. Don't be too sure you have nothing in the water; if it was ever chlorinated with pucks, you probably have CYA. In fact, there's a very good chance you will have too much CYA. And if you do, you'll need to drain off some water and refill before you can shock the algae. So test before you start dumping expensive chemicals in the pool!

    It's good you've been reading; re-read the sections on ridding algae and shocking. You'll see that it's necessary to test often during the process, and for that, you need your own test kit. My recommendation is a TF100 with XL option and speedstir. It will pay for itself in well under a year. Maybe even in one visit to the pool store!
    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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    Re: Newbie Green Algae

    In the beginning of the month we had a tropical storm come thru and so the pool wouldn't over flow, I drained the water out below the skimmer-otherwise I am standing outside w/ my umbrella turning it to waste every few hours. I did refill with water and initially tried to rid myself of the algae w/ chlorine granules diluted in a bucket of water.

    Do you have a link for this test kit?
    20,000 Gallon, Vinyl Liner
    Hayward Sand Filter
    South Mississippi

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    Mod Squad woodyp's Avatar
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    Re: Newbie Green Algae

    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
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    Re: Newbie Green Algae

    Okay, I had the water tested at my local pool store today. I tried to upload the picture, but I cannot.

    Here we go:

    Total Chlorine 0.0
    Free Chlorine 0.0
    pH 7.1
    Total Alkalinity 90
    Calcium Hardness 250
    Stabilizer 30
    Shock Treatment 0.0

    *I am still confused about the CYA level, can someone give me direction?
    20,000 Gallon, Vinyl Liner
    Hayward Sand Filter
    South Mississippi

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    Re: Newbie Green Algae

    I am still confused about the CYA level, can someone give me direction?
    From "ABC's of Pool Water Chemistry" in Pool School....

    Cyanuric acid, often called stabilizer or conditioner, both protects FC from sunlight and lowers the effective strength of the FC (by holding some of the FC in reserve). The higher your CYA level, the more FC you need to use to get the same effect. It is important to know your CYA level so you can figure out what FC level to aim for. If you don't have a SWG or problems from extremely high amounts of sunlight, CYA is typically kept between 30 and 50. If you have a SWG or very high levels of direct sunlight, CYA is typically kept between 70 and 80. If you are using an ORP controller, keep CYA below 50.

    You increase CYA by adding cyanuric acid, often sold as stabilizer or conditioner. CYA is available as a solid and as a liquid. The liquid costs a lot more, and generally isn't worth the extra expense. Solid stabilizer can take up to a week to fully register on the test, so don't retest your CYA level for a week after adding some. Solid stabilizer is best added by placing it in a sock in the skimmer basket. The pump should be run for 24 hours after adding solid stabilizer and you should avoid backwashing/cleaning the filter for a week.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Richard320's Avatar
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    Re: Newbie Green Algae

    Quote Originally Posted by aubie3223
    Okay, I had the water tested at my local pool store today. I tried to upload the picture, but I cannot.

    Here we go:

    Total Chlorine 0.0
    Free Chlorine 0.0
    pH 7.1
    Total Alkalinity 90
    Calcium Hardness 250
    Stabilizer 30
    Shock Treatment 0.0

    *I am still confused about the CYA level, can someone give me direction?
    Assuming CYA is correct (50-50 at best), that's right where you want it to be for shocking. pH is also good for shocking. Ignore everything else until you're done shocking.

    Done shocking means: the water is clear, CC is .5 or less, and you lose less than 1 ppm FC overnight. Your own test kit will be a real help with those last two. Once the shock process is through, the rest of it is easy to fix.
    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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    Re: Newbie Green Algae

    I looked at the CYA/FC chart, but how much chlorine should I use? I have granulated chlorine and also liquid bleach -original -6%.
    20,000 Gallon, Vinyl Liner
    Hayward Sand Filter
    South Mississippi

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    Re: Newbie Green Algae

    The pool print out recommended 4lbs of chlorine, algaecide, 6lbs alkalinity, then flock & clear over the course of 2 - 3 days. I have used flock and clear only once and I HATED it. What an annoying product, I was doing a better job ridding myself of algae dust w/out it......
    20,000 Gallon, Vinyl Liner
    Hayward Sand Filter
    South Mississippi

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    Re: Newbie Green Algae

    Trying to mix pool store advice with the advice here on the forum often leads to confusion, frustration and a murky pool. You should pick one source......it'll save you a lot of confusion.

    You don't need floc and you don't need algaecide and you don't need the "granulated" chlorine. You only need bleach.

    Have you found the pool calculator? A link is in my sig and it will tell you the dosages you need to clear your pool. It looks a little intimidating at first but we'll all help get you on the right track. Post back questions.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Newbie Green Algae

    I was just venting my frustrations in regards to pool store advice. They see me bring in my water sample and think, oh a female-lets sell her everything we can!

    Pool Calculator is intimidating......So I enter my current results and what the minimum or maxium I should have in the pool?
    20,000 Gallon, Vinyl Liner
    Hayward Sand Filter
    South Mississippi

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    Re: Newbie Green Algae

    Okay, I see that w/ my CYA level at 30 I want to shock my pool to an FC level of 12.....so when I enter this in the pool calculator I should put 4 gallons or 5.2 (96 oz jugs).....6 % bleach
    20,000 Gallon, Vinyl Liner
    Hayward Sand Filter
    South Mississippi

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    Re: Newbie Green Algae

    Quote Originally Posted by aubie3223
    Okay, I see that w/ my CYA level at 30 I want to shock my pool to an FC level of 12.....so when I enter this in the pool calculator I should put 4 gallons or 5.2 (96 oz jugs).....6 % bleach
    Yep, you are correct That will raise your FC from zero to 12ppm.

    Continue to maintain shock level until you meet the three criteria to be done shocking - see red lines in my sig.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    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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