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  1. M

    Black areas in grout

    Hi, First: English is not my first language so please excuse my spelling :-) I have a 15 year old indoor pool, owned by me for 5 years, size 22 m3 (5800 gallons). In March this year, after I got a small leak in my chlorine dispenser, I decided to "upgrade" from chlorine to hydrogen peroxide as...