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Hi,

 

serving my salt water pool now by myself for about 1 year and all is fine - but some dark stain spots (assuming algae) on the grouts....mainly on the bottom 


how to get rid off it? HCI Acid my friend said? If yes how much to apply and how long I cant swimming after the treatment?  I have about 80-90 m3 water, 

 

thanks

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