I bought my RO system from a box store four years ago and installed it in my greenhouse. I had a problem at first with low pressure and got a booster pump. But once the water began to flow through the filters, the booster pump was not needed anymore. I bought extra filters but never had to change the ones that I got with the unit. The system is still working perfectly, though it takes about a whole day to fill half of my 35 gallons bin, which is fast enough for me. And I don't drink from the bin.