I know I've posted previously on this, but do any of you have Rain Soft Drinking Water Reverse Osmosis systems? This was quite an expensive system (about 3 yrs ago - my second Rain Soft system) compared to what I understand is available from the big box stores. It worked pretty good to start with, now the water output is very low. So, I purchase and change the 3 filters and it goes better for a couple months. I purchase the filters online as they are about 1/3 the cost compared to buying from Rain Soft. I've checked and rechecked the pressure in the tank (always OK). I'm hesitant to call Rain Soft for a service call as it's likely $75 - not so bad, but over the years, I get the feeling they are over priced, will likely tell me to buy their filters, get no resolve? Any suggestions? Thanks in advance.