17
98-0157 Rev P
4.2.2
Hi Recovery Mode
This mode of operation is designed to limit water usage while still meeting water quality standards.
Hi Recovery Mode uses up to 40% less water than Standard Recovery Mode. The mode is comprised
of Flush, Rinse, and Supply.
FLUSH
Before the MediQA provides water to the loop for dialysis use, the system goes through a flush. This
isolates the water from the loop and dumps all of the water down the drain for a preset time. The
following figures show the valve positioning during this process. Positioning of the valves is
controlled via the PLC.
Figure 1
Figure 2
Figure 3
Concentrate to Drain Valve
Loop Return Valve
Product to Loop Valve
RINSE
After the flush cycle is completed, the RO will go into a rinse. During Rinse the unit continues to run
the pump(s) at a high pressure. Water is flushed down the drain similar to the flush of the
membranes. The position of the valves during this process is the same as Figure 1 through Figure 3.
The Rinse Mode continues until the unit meets a predetermined quality level or until the Rinse cycle
runs for the max time. If it reaches the max time and has not rinsed down to quality level, an alarm
will be triggered. If it reaches quality, it moves to the Supply Mode.
SUPPLY
After Flush and Rinse cycles are completed, the MediQA will go into Supply. Supply is when the RO
begins providing water to the loop for use with the Dialysis machines. This is the process the RO will
be in for a majority of its usage. During the supply mode, valve position is critical as product flow
rate is directly dependent on the valves. Water returning from the loop is redirected to the MediQA
tank via the loop return valve shown in Figure 5. The following figures show the expected position of
these valves during normal operation and are instructed to be fully open via the PLC. This mode is
split into two parts to conserve water, reject to tank and reject to drain. During this period of
operation, the reject water will be sent to drain at a target of 65% recovery.
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