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Sounds to me you've got your waste/good water flows the wrong way round
Close the tap some more, waste flow should be quite a lot and good water should be a trickle
If its similar to mine then yes the tap on the waste is how you flush it, just open the tap fully so you get full water flow, flush it for 20-30 mins then close it slightly till you get about 25% flow into your tank(good water) and 75% waste or there abouts but keep checking your tds readings on the good side, altering the flow rates will alter your tds readings
Ok so you connect your tap/hose to the right hand filter 1st which is a sediment filter? Which then goes into the middle one which is the carbon? Then it goes into your ro? Then it goes through the di?
If it was mine i would disconnect the ro from the di and see what its reading from just the 1st three filters because their the ones doing the bulk of the work, the di jo should just polish what comes out of them down to 000