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Hi CLEM2, While it is true that letting water stand open in sunlight for 24-48 hours will cause chlorine (toxic to plants) to dissipate, it will will do almost nothing to address chloramine (also toxic to plants and used in place and/or in addition to chlorine by most municipal water services for years now). Running tap water through a water filter that contains activated carbon and KDF elements will greatly reduce chlorine and chloramine levels. You can eliminate the remainder of chlorine and chloramine in your water by adding a small amount (~ 1/4 tablespoon per 10 gallons) of sodium ascobate powder (a specific form of vitamin-C available online and in local nutrition stores). -- Happy Growing! -Joe D.
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