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Thread: Can someone tell me if this is green or yellow algae?

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    Can someone tell me if this is green or yellow algae?

    Hi all-- I am beginning to see a green yellowish color on the bottom of my pool, which is resulting in greenish-tinted cloudy/hazy water. My current readings from Bioguard's ALEX system are as follows:

    CYA: 90
    Total Chlorine: 4.1
    Free Chlorine: 4.1
    pH: 7.6
    Total alkalinity: 168
    Adj. Total Alk: 141
    Total Hardness: 221

    I also tried to get my water tested at Leslie's, however, they refuse to test since my chlorine is too high, not sure why my other pool store not mention this. Can someone else confirm if my readings are good? I have recently been having too high of pH and had to add 4.5 lbs of Lo N' Slo (Dry Acid) last night. Hopefully, my pH is correct.

    Can someone please tell me in the pictures if I am developing green or yellow algae, and what steps I should take to remove them? My chlorine levels seem to be fine, so I am not sure why I would be developing any algae.

    Thanks!
    Attached Images Attached Images

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    BioGuard ALEX vs Leslies Pool

    Hi all--I have a 18K gallon pool and I have recently been having too high of a pH level (approx 8.0+). I added 4.5lbs of Lo N' Slo (Dry Acid) last night and here are my current readings this morning from a pool store that uses BioGuard Alex system:

    CYA: 90
    Total Chlorine: 4.1
    Free Chlorine: 4.1
    pH: 7.6
    Total alkalinity: 168
    Adj. Total Alk: 141
    Total Hardness: 221

    Now I also brought the sample to Leslie's Pool Store and they refused to test my water as my Chlorine level is too high. This is odd because I haven't added any shock for over a week, however, I do have chlorine tabs in there. Can someone who has experience with BioGuard's Alex System tell me if this is a reliable reading?

    Is my Chlorine level too high to have an accurate pH reading? I am currently fighting an cloudiness and an algae problem and I'd actually like to add chlorine to the pool, however, I would like to correct my pH problem first.

    Can someone also tell me the difference between BioGuard Alex vs Leslie's Pool and which system would you recommend in testing your water.

    Thanks!

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    linen's Avatar
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    Re: Can someone tell me if this is green or yellow algae?

    Do you have a test kit like these: http://www.troublefreepool.com/pool-...kit_comparison?

    A good test kit is important, pool store tests and the ALEX tend to be unreliable.

    Your chlorine is not fine for your high cya. See: http://www.troublefreepool.com/pool-...mmended_levels According to the poolcalculator.com your FC should never be below 7 ppm.

    Since your cya is appears to be high, you may need to do a drain/refill, but you test numbers are not reliable enough to know for sure.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    linen's Avatar
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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by 3FootPool
    Is my Chlorine level too high to have an accurate pH reading? I am currently fighting an cloudiness and an algae problem and I'd actually like to add chlorine to the pool, however, I would like to correct my pH problem first.
    No, you ph is fine, if you believe your tests (which I wouldn't).
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by linen
    Quote Originally Posted by 3FootPool
    Is my Chlorine level too high to have an accurate pH reading? I am currently fighting an cloudiness and an algae problem and I'd actually like to add chlorine to the pool, however, I would like to correct my pH problem first.
    No, you ph is fine, if you believe your tests (which I wouldn't).
    Is there a reason why Leslie would not test it at my chlorine levels? Also, were you able to figure out from the pictures if this was typical green algae? or mustard algae? Additionally, what steps should I take in the mean time to cure this algae with my current readings?

    Thanks!

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    linen's Avatar
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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by 3FootPool
    Is there a reason why Leslie would not test it at my chlorine levels?
    Because it's leslies? I really don't know, but I do know that you should do your own testing with an appropriate kit.

    Quote Originally Posted by 3FootPool
    Also, were you able to figure out from the pictures if this was typical green algae? or mustard algae? Additionally, what steps should I take in the mean time to cure this algae with my current readings?
    With algae, you need to do the shocking process, but it will be difficult to try and do this without a good test kit.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by linen
    Do you have a test kit like these: http://www.troublefreepool.com/pool-...kit_comparison?

    A good test kit is important, pool store tests and the ALEX tend to be unreliable.
    How often would I need to replace the test reagents for the Taylor 2006? The season is coming to an end and by the time the kit comes to my door, I would have less than a month left. Can it last me until the end of next season? I can't seem to find any literature on this.

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    linen's Avatar
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    Re: Can someone tell me if this is green or yellow algae?

    Although taylor says 1 year, I have used some of my reagents for multiple years. Just make sure you don't let the reagents see extreme temperatures (high or low).
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by 3FootPool
    Quote Originally Posted by linen
    Quote Originally Posted by 3FootPool
    Is my Chlorine level too high to have an accurate pH reading? I am currently fighting an cloudiness and an algae problem and I'd actually like to add chlorine to the pool, however, I would like to correct my pH problem first.
    No, you ph is fine, if you believe your tests (which I wouldn't).
    Is there a reason why Leslie would not test it at my chlorine levels? Also, were you able to figure out from the pictures if this was typical green algae? or mustard algae? Additionally, what steps should I take in the mean time to cure this algae with my current readings?

    Thanks!
    How would Leslie's know what your FC level was if they didn't test it? As for why they would not test water based on the FC level, that's anyones guess.
    8000 gallon outdoor inground vinyl. Sand filter, Hayward 1HP.

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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by kizerman

    How would Leslie's know what your FC level was if they didn't test it? As for why they would not test water based on the FC level, that's anyones guess.
    They tested only FC and stopped there...

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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by linen
    Although taylor says 1 year, I have used some of my reagents for multiple years. Just make sure you don't let the reagents see extreme temperatures (high or low).
    How can you tell when it has gone bad?

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    Re: Can someone tell me if this is green or yellow algae?

    2 Days ago I added 2 bottles of liquid chlorine....which should have raised my Chlorine level to approx. 15 PPM, and I added granular shock the following day (last night) and my Chlorine level is probably 25 PPM now. I did see some white milky residue left from the algae, however, I still see a green/yellowish tint on the bottom of my pool. If I brush over it, it disappears and forms a cloud. Is this stuff definitely algae or I am I just aimlessly adding in chlorine.

    However, I am concerned that my pH may be little bit high, roughly at 8 according to Leslies. I am receiving my Taylor FAS-DPD K2006 test kit tomorrow, so I can record my results better. However, would this have even significantly affected the chlorine killing off the algae? Would I be able to test my pH with that high of a chlorine level? Also, what should my next steps be?

    Someone please help!

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    Mod Squad jblizzle's Avatar
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    Re: Can someone tell me if this is green or yellow algae?

    You can not trust the pH test when FC > 10ppm. Let the FC drop and then test and adjust the pH.

    How does your water look?
    Have you read the shock process in Pool School?
    Post up a full set of results when you get your kit. Then doing an OCLT can help determine if you need to go through the full shock process (likely if you still see algae or the water is very cloudy).
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by jblizzle
    You can not trust the pH test when FC > 10ppm. Let the FC drop and then test and adjust the pH.

    How does your water look?
    Have you read the shock process in Pool School?
    Post up a full set of results when you get your kit. Then doing an OCLT can help determine if you need to go through the full shock process (likely if you still see algae or the water is very cloudy).
    The water looks like the pictures above. It's clear but I see green yellowish color on parts of the floor of the pool. Does that look like algae to you?

  15. Back To Top    #15
    Mod Squad jblizzle's Avatar
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    Re: Can someone tell me if this is green or yellow algae?

    If it brushes off, seems like algae. If it does not brush off, could be stains. Have you felt it? Is it slimy?

    The OCLT will help tell if something is in the water consuming the FC.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Can someone tell me if this is green or yellow algae?

    I finally received my Taylor K-2006 and just ran a set of tests.

    FC - 9-9.5
    CC - .5
    pH - 7.9 (acid demand - 5 drops)
    Alk - 200-210
    CYA - 45-55
    Calcium - 225-240

    I have ranges on these because I ran it twice (except for CYA) and wasn't positive which one to take but it all appears to be close.

    Does my high chlorine level affect the pH and alkalinity ready? Please let me know what you think of these readings and how I should proceed in killing off algae. My pool does look a little clearer today.

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    Mod Squad jblizzle's Avatar
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    Re: Can someone tell me if this is green or yellow algae?

    pH test suffers with FC > 10ppm ... so your reading should be pretty good.

    Lower the pH to 7.2 and then follow the shock process outlined in Pool School until you pass the 3 tests to stop. Your shock FC level is around 20ppm for your ~50ppm CYA. You do not want the CYA to get higher, so only liquid chlorine from now on.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Can someone tell me if this is green or yellow algae?

    Quote Originally Posted by jblizzle
    pH test suffers with FC > 10ppm ... so your reading should be pretty good.

    Lower the pH to 7.2 and then follow the shock process outlined in Pool School until you pass the 3 tests to stop. Your shock FC level is around 20ppm for your ~50ppm CYA. You do not want the CYA to get higher, so only liquid chlorine from now on.
    Awesome...the water actually looks quite clear now with white residue left from the algae. Do you think I should just vacuum (to filter) or (to waste)? Do you think my Hayward SandFilter S220T will pick up most of this stuff, and then I will just back wash? I don't want to vac to waste if I dont have to, as to avoid diluting it with hose water once I re-fill.

    So does that mean no more chlorine tablets? (just bought a brand new bucket a month ago!). Also, according to the Taylor pamphlet that came with the test kit, FC should be around 2-4, while this site is saying 5-6 with my CYA level. Does Taylor not consider the CYA level?

    Thanks!

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    Mod Squad jblizzle's Avatar
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    Re: Can someone tell me if this is green or yellow algae?

    If there is not much to pick up, then just see how the sand filter does.

    No more tablets!!! They add CYA and you are at the top of the recommended range. They will last for years, so you may be able to use them while on vacation or if your level drops due to backwashing and winter.

    Basically, you are correct, Taylor does not take the CYA into account ... there are some weird legal reasons why companies never say more than 4ppm too. Government and pool companies seem to be VERY slow accepting the proven chemistry and change their ways.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  20. Back To Top    #20

    Re: Can someone tell me if this is green or yellow algae?

    ahhhh so I was vacuuming and I actually noticed that there is still tint of green/yellow on the bottom of my pool. Is this definitely algae or could it be something else? If i brush over it...it forms a cloud...not a very good picture below...
    Attached Images Attached Images

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