http://www.gapswater.co.uk/acatalog/copy_of_Reverse_osmosis_kits.html
What does it mean when you have a 98% rejection rate? Does it mean that 2% goes down the drain?
98% rejection rate. It means it rejects 98% of the water.
Don't sound right though. If 1000 litres of water is a quid on the meter, 1000litres of pure water would cost £50.
no its as window washers says, it rejects up to 98 % of the tds, not the water.
I have an hf5 4040 membrane from gaps, you can tweak the waste/pure ratio by means of a tap, have mine set up to produce about half as waste.
My supply tds is about 360 ppm and the product after ro is about 8-10 ppm, so not far off a 98 % rejection rate .
Used to a have a merlin and set up under same conditions, getting on for nearly 75 % water went to waste and had a product of 40 ppm ( 4 times that of the hf5 ) giving a rejection rate just less than 90 %.