As mentioned above, you really need to have a pressure gauge on that system. We have pressure gauge add on kits.
Those self piercing needle valves are sometime problematic - can you open it any more and get more flow to the system?
You didn't ask - but in your pictures I noticed two problems with your DI stages:
1. They are horizontal.
Horizontal DI housings are a design intended to minimize the original cost of the system - you should be prepared for the tradeoffs. Horizontal DI units typically contain 8 oz. to 16 oz. of resin. Typical vertical DI cartridges contain 20 oz of resin. Obviously the more resin contained in the housing the longer it will last and the better treatment it will provide.
Some horizontal DI housings are not refillable - you'll therefore have to pay for a new housing every time you need to replace the DI resin. The cost of repeatedly replacing the horizontal housing will far outweigh any money saved up-front in purchasing the unit.
Perhaps most importantly, horizontal DI housings are a less than ideal arrangement for water treatment. DI resin beds settle through normal use over their life span. You'll note that a cartridge that was full when new can sometimes have a ? inch of empty space in it when fully expended. When DI resin settles in a horizontal housing, it leaves a pathway (of least resistance) along the top of the housing where water can flow while coming into minimal contact with the DI resin.
You’ll note that the output from the DI housing is at the center of the end of the housing. Depending upon how your system is configured, RO water may enter the DI housing in port, fill up the housing until the water level reaches the out port (i.e., fill up the bottom half of housing), and then exit the DI housing. Your RO water has been in contact only with half the resin in the housing.
What to do? At a minimum, unclip those DI housings and orient them vertically with bottom up flow. You may have to get some additional tubing to do this.
2. Your DI resin cartridges are not full of resin. This is how the vendor sent them to you? Wow. You can expect that those resin beds have fluidized and the anion and cation beads have separated - this will reduce the quality of the water treatment. You can also expect much less than optimal contact between the water and the resin. What to do? Contact the vendor and have them send you properly packed cartridges.
Check the tds of your tap water, RO water, and DI water and let's see how this system of working.
Use the adjustable flow restrictor to adjust the flow of waste water so you have 4 parts waste to 1 part purified water.
Russ
