Is a MMF necessary as feed to a RO unit?

Not necessarily. Most RO systems utilize a cartridge filter in the feed line. This filter has a micron rating range of 1-5 microns.

The MMF will remove particles of a nominal 10-15 micron rating. Therefore, without the MMF, the cartridge filters will foul fairly quickley. The MMF also keeps suspended solids, from upsets in the system, from entering the other pretreatment vessels.

More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.