Saw this ad on TV this morning. Reminded me of a better version of a brita filter. Claims 0 ppm for dissolved solids and TV ad claims they'll send you the TDS meter 'free'.
Only does about 22.5-30 gallons before filters have to be changed and the filters dont seem to be on the cheap side. $55 for 4 filters. Maybe growers with small collections would find this handy? What do ya'll think?