Why is there algea growing in my flow meters?

How to clean flow meters out when there is growth in them.

Since often times feed water sources have organic contaminants, the flow meters when exposed to light can allow for the organics to grow   inside the clear flow meters on the front of the unit.  This happens in the Recycle flow meter and the concentrate flow meter as those two have the rejected water of the system running through them.  If the light source is eliminated then the growth will stop.  The flow meters can be cleaned out following these procedures.  

First carefully remove the threaded top plug from the flow meter, and withdraw the float from the top.  All necessary instrument components are now fully accessible for cleaning with a bottle brush, and appropriate mild soap solution (Do not use cleaning agents that will damage float, tube, or o-rings).  Before the meter is reassembled, inspect all parts for damage.  O-rings should be replaced during meter maintenance and cleaning.  

To reassemble, carefully guide the float back into the tube.  When installing float/guide assembly make certain that the end of the guide fully engages the inlet and/or outlet float stop.  Reinstall and tighten fittings in appropriate ports. 

Hard water deposits can be removed with a 5% acetic acid solution (i.e. vinegar)