just bought new membranes and filters for my 450gallon per day reverse osmosis system and got 2 di vessels with resin. tds reads 18 before it goes into my 1st vessel,4 after 1st resin ( old resin) and 0 after 2nd vessel. it took 2 days for it to read 18 after the 2nd vessel while still reading 18 before entering any resin. the amount of water im getting is more than double i got before, ive been told its bcos the heat is expanding filters/membranes allowing more water thro than normal which in affect is blasting through my resin. any1 else experiencing this??