Quote:
Originally Posted by -=James=-
What is the pressure gauge for? Dont I just turn the hose on when I need RODI water?
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RODI systems are designed to work optimally at a certain pressure & temperature. Without a pressure gauge you have no idea whether your system is going to perform according to expectations. If the pressure is too low, it will be very inefficient, making more waste than pure water and taking much longer to make the pure water. If it's too high (unlikely) you run the risk of blowing your RO system or even your plumbing.
By all means you may simply turn on the hose & let 'er rip when you need water but I like to know what's going on. Many RO systems come with a pressure gauge installed between the prefilters & the membrane to monitor performance, ie, when your membrane might need replacing. I've decided to take it a step further and use two pressure gauges, the one you see in the photo to measure input pressure & the one before the RO membrane. This makes it very easy to determine if there's a drop in performance due to increasing pressure differential between the two gauges. Most of the time all I need to do is replace the first stage 5 micron poly prefilter & I'm good for a bunch more gallons.