there are 2 low cost ...

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 there are 2 low cost methods of harvesting grey water for household use

1. by a ozonater which i have costing RS 5,000 connected by a pipe to a 20 liter plastic water jar which purifies this in 30 minutes-a bigger model could also be made

2. a better method is to attach a UV  WATER FILTER connected to the kitchen tap the bulk purchase price of which is about US $ 10 EACH  but may retail at about US $ 30 which gives water @ 1 liter per second with zero e-coli with a optional porus filter if there are particles in the water