Defender Support

Turn the concentrate valve clockwise until the permeate flow rate and the concentrate flow rate are at designed standards. Turn the recycle valve until the recycle flow rate is at the desired rate. If necessary, adjust the pump throttle valve, concentrate valve, and con- centrate recycle valve until the proper flow rates are achieved while not exceeding 150 PSI pump pressure and not reducing the pump pressure below 80 PSI. The concentrate recycle flow rate and the concentrate flow rate must equate to the minimum flux rate or higher in high flow feeds or damage to the membrane may occur.

Once the flow rates have been adjusted, monitor the system over the first two weeks and make fine adjustments to maintain the proper flow rates. When there is a change in the feed water TDS level or temperature, the flow rates may need to be re-adjusted. The recycle flow rate can be determined using the desired Recovery Rate (75% maximum) and the Permeate Flow Rate. The equation is as follows;

• RO System GPD Rating / 1440 mins (mins in a day) = Permeate Flow Rate GPM

• Permeate Flow GPM / 75% (0.75) = Total Flow GPM

• Total Flow GPM - Permeate Flow Rate GPM = Concentrate Flow GPM

• Minimum Flux Rate (determined by membrane size / diameter) GPM - Concentrate Flow Rate GPM = Recycle Flow Rate GPM

• 4.0" Membrane Minimum Flux Rate - 3.0 GPM

Example:

• 2000 GPD System

• 2000 GPD / 1440 Mins = 1.39 GPM Permeate Flow

• 1.39 / 0.75 = 1.85 GPM Total Flow

• 1.85 GPM - 1.39 GPM = 0.46 GPM Concentrate Flow

• 1 (min 2.5" Membrane Flux) - 0.46 GPM = 2.54 GPM Recycle Flow

Once the adjustments are made, the system is operational.

IMPORTANT! Be sure to flush the storage tank as the initial water the RO makes during adjustment is not up to quality. This can usually be done by letting the tank fill for about 50 gallons and emptying the tank twice or directing the permeate water to a drain until the water quality stabilizes.