- Aug 7, 2011
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Rainwater..it is best to filter and use it within a weeks time. Greywater..needs to be used within 24 hours. I didn't get to use my washer/rinse water till 48 hrs later, last time..so I just sprinkled a very little bit of baking soda in it. 32 gals..maybe a tsp of baking soda. It freshened it right up. That water, I just used it to hose off the chicken tractor of chicken poo though. I had used Soapnuts for the laundry detergent, so it was all non-toxic.zippitydooda said:Newbie question: so when rain harvesting or using gray water, HOW do you keep it from turning green with algae? Do you treat it somehow?