Anders Eriksson

Bottom of pool started to be brown

39 posts in this topic

Since some week my pool have started to create more and more brown areas at the bottom. Most of it can be brushed and sucked up, but not all. And after a cleaning it is back very fast.

 

Pool is 43 m3

It has a salt chlorinator Emaux 15

Salinity now is little high due to a faulty meter and to much salt added. Abut 6.

Ph is 7.6 and Cl 0.6

Temp around 29

I tried to add solutoin for alges, but no effect.

What is causing this and how to deal with it?

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046.JPG

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2 hours ago, Anders Eriksson said:

Cl 0.6

you have brown algae because your CL is much too low for a pool exposed to sun!

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2 hours ago, Anders Eriksson said:

Cl 0.6

you have brown algae because your CL is much too low for a pool exposed to sun. to get rid of them shock your pool at least twice (7.0-8.0 ppm) and brush, brush, brush. algaecide won't help!

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3 minutes ago, Naam said:

you have brown algae because your CL is much too low for a pool exposed to sun. to get rid of them shock your pool at least twice (7.0-8.0 ppm) and brush, brush, brush. algaecide won't help!

Yep.

 

And a reminder for calculating required quantity of sodium hypochlorite liquid.

 

For a 43m3 pool:

 

43,000 / 1,000,000 = 0.043 litres per ppm

 

8 ppm = 0.043 x 8 = 0.344 litres of sodium hypochlorite.....

 

BUT

 

sodium hypochlorite typically supplied at 20% solution so you'll need

 

0.344 x 5 = 1.72 litres

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33 minutes ago, Naam said:

you have brown algae because your CL is much too low for a pool exposed to sun!

Tried liking your post but for some reason TV just keeps coming up error.

 

So....

 

:smile:

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Thank you Naam and grollies!

I have Soda ashes and something for schocking, is the name chlorine schock?

Which can i use?

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A useful tool

https://www.totalpool.co.uk/index.php/resources/dosing-calculator

 

https://swimmingpoolchemicals.co.uk/dosecalc.php

 

This looks like a useful design tool I have not played around with it yet, used to do all my calculations the hard way, will play about with it in the week . and post later

https://draftsman.files.wordpress.com/2013/11/main-pool-lanai-new.xls

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Not enough chlorine Soda ash raises your pH and chlorine shock will extra chlorine , I would also suggest at some stage to lowering the pH to 7.2 

 

I would suggest your chlorinator is not wok or the plates are clogged up

 

A useful tool

https://www.totalpool.co.uk/index.php/resources/dosing-calculator

 

https://swimmingpoolchemicals.co.uk/dosecalc.php

 

This looks like a useful design tool I have not played around with it yet, used to do all my calculations the hard way, will play about with it in the week . and post later

https://draftsman.files.wordpress.com/2013/11/main-pool-lanai-new.xls

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2 hours ago, Anders Eriksson said:

Thank you Naam and grollies!

I have Soda ashes and something for schocking, is the name chlorine schock?

Which can i use?

simply chlorine in whatever form you have but preferably liquid chlorine should be used. at the same time you apply acid to balance the pH that will shoot up with the shocking. no soda ash! that would cause an additional pH increase.

 

as member "sappersrest" mentioned... your pH is too high. get it down to 7.0-7.2 (personally i prefer 6.8).

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3 hours ago, grollies said:

Tried liking your post but for some reason TV just keeps coming up error.

 

So....

 

:smile:

thaivisa bloken, rike no work!

1 person likes this

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1 hour ago, sappersrest said:

Not enough chlorine Soda ash raises your pH and chlorine shock will extra chlorine , I would also suggest at some stage to lowering the pH to 7.2 

 

I would suggest your chlorinator is not wok or the plates are clogged up

 

A useful tool

https://www.totalpool.co.uk/index.php/resources/dosing-calculator

 

https://swimmingpoolchemicals.co.uk/dosecalc.php

 

This looks like a useful design tool I have not played around with it yet, used to do all my calculations the hard way, will play about with it in the week . and post later

https://draftsman.files.wordpress.com/2013/11/main-pool-lanai-new.xls

I suspect the cell is not working! I have only had it for 8 months and I have cleaned it two times. Latest 1 week ago. But i can allreado see it has started to build up scale. Normally I only run system 2+2 h per day, but very little use of pool. I run it at 100% at 100. Now I have started it to run continously. It will be very expensive if I should change the cell every 8 months! The cost of the cell is half of the total price. Here in Th it cost about 360 USD. I have tried to find a cheaper source.

So I will put Acid in to get the Ph at 6.8-7.2

How much shock chlorine should I ad? It is in powder form. What is the chemical name for it?

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2 hours ago, Naam said:

simply chlorine in whatever form you have but preferably liquid chlorine should be used. at the same time you apply acid to balance the pH that will shoot up with the shocking. no soda ash! that would cause an additional pH increase.

 

as member "sappersrest" mentioned... your pH is too high. get it down to 7.0-7.2 (personally i prefer 6.8).

I disagree with your pH levels. Looks like an in-ground concrete pool. I keep my pH at 7.8

 

Recommended levels are between 7.4 and 7.8

 

I'd recommend Anders shocks the pool and let the pH level rise.

 

Also, get rid of the plant life round the pool.

 

There should be guidelines for how much Cl granule to add for the volume of pool water?

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31 minutes ago, grollies said:

I disagree with your pH levels. Looks like an in-ground concrete pool. I keep my pH at 7.8

 

Recommended levels are between 7.4 and 7.8

any recommendation can be found by asking a bunch of eggsburts. my eggsburt is my wife who dictates since we have pools (~35 years) a pH of 6.8, preferably 6.2 - 6.4 which i find agreeable with my skin although i don't do like her 200 lengths every day.

 

by the way, most recommendations are 7.2 based on the average pH of tears to avoid eye irritation. moreover, the pH of human skin is quite low (around 5.5), i.e. anything value above that and applied for an hour or two reduces the skin's natural power to kill bacteria.

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46 minutes ago, grollies said:

There should be guidelines for how much Cl granule to add for the volume of pool water?

get liquid chlorine from a pool shop. dissolving granules takes too long.

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One new thing I now noticed is this:

When I fill the glass with water to check Cl and add 4 drops from the yellow bottle and shake it. The tube is not showing any bit yellow which means 0 Cl. When I then let it stand and look after say 20 minutes the colour is very yellow, showing over 3.

Why is it like that?

Earlier I have noticed the change of colour when I shake the tube and no big change after that.

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