Matt is this what you do with your waste or is it fitted to a drain outlet
Dave
in the summer it goes into a rain water butt, waters the lawn and flower beds and tomato plants (toms really love to be watered all the time, i have 5 cherry tom plants and we have had over 200 toms so far, so much the mrs has made tom and chillie jam, lovely stuff)
im a meter, so waste water costs me, so this winter im adding a extra RO for the waste
oh and my water is 460 TDS, so yours at 75, you should be thankfull