Please help with green pool. Newbie. Tried all guides

Algae problems in swimming pool water.
Green (cloudy) water or slimy pool walls.
Black algae. Mustard algae. Pink or white pool mold.
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My Pool: 10k gallons, sand filter

Please help with green pool. Newbie. Tried all guides

Postby mouserider » Wed 16 Aug, 2017 11:26

Hi forum, i just moved to the house with a swimming pool and have decided to maintain it by myself. I knew nothing

So basically it was ok for monthes, untill i left for couple days, it was green when i came back.

I was using triple action chlrine tablets, ph minus, ph plus.

readings on time pool was green:

Chlorine 0
PH 7.4
Alkalinity 200

So i have read guides how to shock the pool (all of them =).
First i moved alkalinity to 110 with dry acid.
Then i raised PH (it dropped after dry acid ) to 7.2 back

Added 1.5kg granular chlorine (my pool is 42000 litres, or 10 000 gallons)

Filter on 24h (sand filter)
in 36 hours (it took way more, then i was expecting) pool was blue, but cloudy. i was happy, i have added some alkaecide

in 48 hours (PH, Chlorine, Alkalinity = normal) Pool went green again!

Shocked it again (1.2 kg of granular chlorine) > filter on non-stop
in 36 hours its still cloudy and green
Readings are the same:
Chlorine above 3.0
PH 7.2
Alkalinity 110

P.S when i say pool is green,i mean it has no debris, and if i try hard, i can see the silhouette of bottom drain (deep is 1.8 metres)
P.S i tried to add periodically clarishock, algaecide with brightener. Nothing helps

I have read all guides on this forum, outside. Tried to do eveyrthing accordingly, back-washing every 8 hours, filter is on for a week now almost non-stop, twice shocked, all reading normal.

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Joined: Wed 16 Aug, 2017 21:12
My Pool: 9,000 gallon concrete kidney pool. Cartridge filter

Re: Please help with green pool. Newbie. Tried all guides

Postby slinkyjosh » Thu 17 Aug, 2017 01:36

I am NOT a pro so if anyone contradicts me I'd follow their advice.
First check and see if you aren't getting a sufficient pressure. If you can't see the water moving 1 inch below the water surface on the far end of the pool then you're chemicals may not be getting properly mixed. I'm guessing you weren't using conflicting treatments at the same time but that's a mistake I've made in the past.
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My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Please help with green pool. Newbie. Tried all guides

Postby Denniswiseman » Fri 18 Aug, 2017 17:20

You say you have read all the guides. Have you got a decent FAS/DPD testing kit
Stop adding all the pool store stuff
What are your numbers
Use these basic chemicals to balance your pool
Liquid chlorine (sodium hypochlorite or plain bleach)
Muriatic acid (hydrochloric acid) to lower pH and TA
Bicarbonate of soda to raise TA
Aeration will raise pH only
Soda ash will raise pH and TA
Using the products you have bought will be a constant Yo-Yo
With the way you are chlorinating you probably have an excess of CYA which will render your chlorine ineffective
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm
You very likely have an algae bloom and need to Slam with relation to Chlorine / CYA Chart and Pool Levels

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