last tusesday after coming off my pointers i have decided ive had enogh so im going wfp ive only a small round, it consits of 240 semis .etc nowt to big im going for a 350ltr system as ive only got a berlingo what would be the approx running cost ie resin etc any addvice on which system to go for
Your area is not in your profile so it's not possible to give an answer because there's no way of knowing if you are in a hard or soft water area. Also, this would make a difference regarding whether or not you need an RO or just DI resin only. I suggest that you very first outlay should be a TDS meter (usually about £12-£25) to determine the hardness of the water. Also, whether or not you are on a water meter would be a factor.
So post again please with:-
1) TDS of water
2) State if on a meter
3) If on a meter state the approx cost per meter (1,000 litres).
The answers you supply will give rise to more questions but there's no point in answering them until you answer 1 - 3 above.
Sorry can't be more help just yet.