Green murky water

Causes and cures for cloudy swimming pool water.
Milky pool water, white, pink, brown, purple, black cloudy water.
Jphannon
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Green murky water

Postby Jphannon » Fri 17 Aug, 2018 01:46

We went away on holiday for ten days and when we came back we were greeted with green smelly pool water which won’t turn clear, we’ve tried algecide, chlorine granulas, chlorine tablets, but nothing works. Does anyone know how to make it clear again?
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Denniswiseman
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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: Green murky water

Postby Denniswiseman » Fri 17 Aug, 2018 04:19

You need to Slam with the correct amount of liquid chlorine (sodium hypochlorite or plain bleach)as indicated in your Chlorine / CYA Chart and your recommended Pool Levels
You also need a decent FAS/DPD testing kit. Pool stores and strips won't do
SLAM means Shock Level and Maintain
Read and follow the instructions carefully
Jphannon
Pool Enthusiast
Pool Enthusiast
Posts: 23
Joined: Fri 17 Aug, 2018 01:22
My Pool: Above ground steel frame, 12ft by 48” 500 gallon sand filter, on grass, floor slightly sloped

Re: Green murky water

Postby Jphannon » Fri 17 Aug, 2018 05:57

Thanks for the reply, but on closer inspection the pool seems to just be cloudy and white as the sun was not shining on the pool when I took the image. The water seems to foam when it is disturbed in any way as well. We have already increased the chlorine levels to the point that you can smell it when you go near the pool. Could you suggest another option?
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Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1288
Joined: Tue 06 Sep, 2011 05:48
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: Green murky water

Postby Denniswiseman » Fri 17 Aug, 2018 08:12

First of all get a decent FAS/DPD test kit(Taylor K2006c or TF100)
Then lets have your numbers
FC:
TC:
pH:
TA:
CH:
CYA:
Chlorine pucks and granules have a high proportion of Cyanuric acid which when it builds up renders 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

Yours is a classic tale of excessive CYA and no chlorine for 10 days and an algae bloom
The smell of chlorine is not chlorine but chloramines
There is no substitute for proper testing
Jphannon
Pool Enthusiast
Pool Enthusiast
Posts: 23
Joined: Fri 17 Aug, 2018 01:22
My Pool: Above ground steel frame, 12ft by 48” 500 gallon sand filter, on grass, floor slightly sloped

Re: Green murky water

Postby Jphannon » Fri 17 Aug, 2018 08:33

Could you reccomend one?
Jphannon
Pool Enthusiast
Pool Enthusiast
Posts: 23
Joined: Fri 17 Aug, 2018 01:22
My Pool: Above ground steel frame, 12ft by 48” 500 gallon sand filter, on grass, floor slightly sloped

Re: Green murky water

Postby Jphannon » Fri 17 Aug, 2018 08:38

*recommend
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1288
Joined: Tue 06 Sep, 2011 05:48
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: Green murky water

Postby Denniswiseman » Fri 17 Aug, 2018 08:41

I already have
Taylor K2006c or TF100 byTF Test kits
Both can be bought online in the States
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1288
Joined: Tue 06 Sep, 2011 05:48
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: Green murky water

Postby Denniswiseman » Fri 17 Aug, 2018 08:47

By getting this type of kit will put you in charge of your pool and you will only put in what you need to balance it
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
Jphannon
Pool Enthusiast
Pool Enthusiast
Posts: 23
Joined: Fri 17 Aug, 2018 01:22
My Pool: Above ground steel frame, 12ft by 48” 500 gallon sand filter, on grass, floor slightly sloped

Re: Green murky water

Postby Jphannon » Fri 17 Aug, 2018 08:54

I live in the UK do you know of any good kits available in my country?
Jphannon
Pool Enthusiast
Pool Enthusiast
Posts: 23
Joined: Fri 17 Aug, 2018 01:22
My Pool: Above ground steel frame, 12ft by 48” 500 gallon sand filter, on grass, floor slightly sloped

Re: Green murky water

Postby Jphannon » Fri 17 Aug, 2018 09:04

Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1288
Joined: Tue 06 Sep, 2011 05:48
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: Green murky water

Postby Denniswiseman » Fri 17 Aug, 2018 09:19

I dont think it is any good as it doesn't measure CYA and TA
Teapot may chime in with a suitable local alternative
I bought mine from the States but don't remember where
Here is a link to one of them https://www.ebay.co.uk/itm/122920964292 It may be worth searching for more but try and get one that pays the import duty and VAT
Jphannon
Pool Enthusiast
Pool Enthusiast
Posts: 23
Joined: Fri 17 Aug, 2018 01:22
My Pool: Above ground steel frame, 12ft by 48” 500 gallon sand filter, on grass, floor slightly sloped

Re: Green murky water

Postby Jphannon » Fri 17 Aug, 2018 09:40

Could you tell me what the following mean, as I could buy the testers separately
FC:
TC:
pH:
TA:
CH:
CYA
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1288
Joined: Tue 06 Sep, 2011 05:48
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: Green murky water

Postby Denniswiseman » Fri 17 Aug, 2018 10:11

FC: Free Chlorine
TC: Total Chlorine
CC: Combined chlorine
pH: pH
TA: Total Alkaliity
CH: Calcium Hardness (Not a problem with a liner unless very high)
CYA: Cyanuric acid
Your free chlorine and combined chlorine become your total chlorine
Your combined chlorine is your used up chlorine
Jphannon
Pool Enthusiast
Pool Enthusiast
Posts: 23
Joined: Fri 17 Aug, 2018 01:22
My Pool: Above ground steel frame, 12ft by 48” 500 gallon sand filter, on grass, floor slightly sloped

Re: Green murky water

Postby Jphannon » Fri 17 Aug, 2018 10:46

Is there a chance I could correct the water with only granulated chlorine, algecide and chlorine tablets or would I need other chemicals as it is proving very difficult to find testers for each of the variables
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1288
Joined: Tue 06 Sep, 2011 05:48
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: Green murky water

Postby Denniswiseman » Fri 17 Aug, 2018 11:04

The La Motte kits are similar http://www.lamotte.com/en/pool-spa/kits-reagents/fas-dpd/7022-01.html
Without testing you are guessing and if you have been using pucks and granules for a long time would have an excessive amount of CYA rendering you chlorine ineffective causing an algae bloom
Algaecide can cause more problems and isn't necessary in a properly sanitised pool
The only alternative is to drain your pool and start over with fresh water
You could then use stabilised chlorine untill you reach an appropiate CYA level and then continue with liquid chlorine (search for sodium hypochlorite) or plain bleach (no additives)

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