Have you checked the voltage being delivered at the pump while the system is running?
Can you disconnect the output from the pump so it goes into a bucket rather than the membrane? If so - what is the flow? What is the voltage at the pump when running with an open discharge?
Question for the experts:
Isn't the feed pump output flow / product flow ratio usually around 6.5?
They are reporting about 21/8 or about 2.6 so they need to determine if the decreased bypass flow is restricted by:
- high back pressure on the feed pump output
( a clogged output from the bypass side of the membrane housing would restrict the total flow and thus reduce the product. But, it doesn't seem like it would change the ratio)
- low voltage on the pump
- bad pump
- restricted flow into the pump
You solve this problem like any electrical
problem. Trace the water flow and measure the input and output at each discrete unit:
- input to pump
- output from pump
- output from membrane on bypass side (directly from the membrane BEFORE it goes into the tubing)
- output from membrane on product side (directly from the membrane BEFORE it goes into the tubing)
- at the discharge port over the side for the bypass
- voltage at the power source with no pump running
- voltage at the pump connection with no pump running
- voltage at the pump with the pump running
- voltage at the power source with pump running
At some point you find a number that does not match the necessary specs