Hi guys my 100gpd ro system is playing up and i was thinking of changing this to another, i have been lookinjg on ebay and have found some cheap enough and they appear to be 200gpd ro system. first of all i would like to know what the difference is between 100gpd and 200gpd does this mean the tank outside will fill up quicker than my 100gpd and also i have noticed a couple of different ones ie.. pure-freedom do one 200gpd with di vessel for £169 another place window cleaning warehouse do one for £210 200gpd without di vessel but theirs looks to have more on board. would someone please suggest something for me i need to order one monday so i would appriciate all the help. at present i use a pure freedom 100gpd ro system with a di vessel using 1/4 inch i think john guest type push fittings, i use a booster pump to increase water flow. so please as many suggestions would be helpful.