[andrew kennedy]

have just started using wfp after doing traditional but need to know if the set up i bought is ok cause been going through resin very quick system i bought is second hand van has water tank then grey box for battery and switch and pump which i had to replace plus blue tank for resin water is purified when being pumped out of tank?

any ideas? 

[escorttdi]

u need 2 di resin bottles side by side 0r ro system

what is ur tds reading out tap???  anything over 80/90tds out tap  i would go down the route of r o system

my tap water is 50/60 use to have 2 di vessils  witch lasted a while... i use 600 litres a day

but now got a 350 gpd ro producing  450 litres in 24 hours......... no  resin

[Londoner]

Do you have a TDS tester? If you go on gardiners website you can caculate what your resin use should be. Thats a start. Also how big is your DI vessel?