Hi guys Ive been reading these threads for a while now, found some answers for my questions, so i hope you can help me on this one. I have a merlin 720gpd ro (the one thats discontinued), good couple of weeks ago tds started to go up, it went up to 100 ppm, so i bought 2 new membranes and new prefilter. After installing them, tds reads 140ppm, after running it for at least 10 hrs, its still 130 ppm. I have changed membranes before with no problems at all, tds normally settled around .14, tap water is 300-350. Now the membranes i ordered from thecleaningwarehouse as they had the cheapest deal: 120 for two +vat. I read somewhere that these membranes have a 8 month shelf life, could it be that they tried to get rid of these before xmas? I called them yesterday, a guy starts to tell me to check my resin, so im like no that has nothing to do with it, so he says Kevin is not in today he is the ro expert, try calling tomorrow. I tried calling them today, line is not working, they are gone to holidays propably... What do i do now? Has anyone ever got a refund on such an item? My water pressure is low, 30psi, but 140 ppm is just ridiculous.