APEC RO-CTOP-C, Installation Instruction

7

How to Replace Stage-3  Membrane (MEM-90)

Change every  2-3 years:

If Stage 1 & 2 pre-filters are changed regularly, the Stage-3 Membrane can last 2-3 years depending on 
your input water’s quality. 

The Membrane needs replacing when:

 The 

TDS

 (total dissolved solids) level 

in the pure water starts to increase (detected by a TDS meter from APEC), or when the 

water taste quality 

starts to decline.

 Replace the Membrane as follows:

1.    Locate the Membrane-Housing (with “Filmtec Membrane” label on it.)

2.    Disconnect tubing from the Membrane-Housing Cap at Point 

I

. Remove membrane-housing cap by 

turning it counter-clockwise (you can use membrane housing wrench to help opening it). Pull out the 
old membrane using pliers. Then insert the new membrane into the housing. 

Make sure the end with 

“2 small black rings” goes in first as shown below

 (See

Figure F

)

.

3.    Close the cap on membrane-housing.  Reconnect tubing to the cap at Point 

I

. 

Let RO run for 10-

15 minutes to flush out the new membrane

 – discard the output water. When done flushing, 

the pure water is ready for use.

Figure F

I