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a filter for my main supply of water if its coming outta the tap at 300 ppm @.5 conversion i believe at least just bought this tdstestr from eutech instruments at my local hydroponic shop and the sales rep was not helpful nor really explained how too use, etc. sorry for being such a newb >.>...

i would like too know on past grow experience and knowledge of others how many or what would be a good number of plants too reservoir ratio and with these specs of the area I'm using etc. 2 flood trays for ebb & flow system trays are 24 x 44 x 7 50 gallon reservoir and room size is 5 x 7 x 7...