i have just fitted new membrane on my 4040 but i have a serious problem the tds will not go down,tap water is 410 tds,ran my 4040 for 1 hour tds reading 305 and it as been like that all day,looked at the membrane to make sure all seals there,they are so i cannot work out the problem,rang gapwater to ask for advice which they were very helpfull but still not sorted problem,have i put pipes wrong way around?not sure,i have taken some photos of my set up which i can email someone to help just to make sure it is fitted correctly,help