how long does your resin last?
tds in 10-14 run 2x 11l di vessels in sequence and draw approx 3000-3500 litres a week and a 25 litre bag lasted approx 8 months to a year.
bought a new bag of tulsion mb115 2 weeks ago tds in now is 20-24

and already its shows 4 after 1st di and 4 after 2nd, cant understand?
anyone shed any light on this?
many thanks