Ro systems

[Posh]

On eBay for around £60 they sell 2,3,or 4 stage systems but they say for aquariums. Are they any good for making pure water for wfp for my backpacks. Only want about 50ltrs a week and thought one of these might do. Realise I will need di system. What one would be best. 2,3 or 4?

 

[chip]

4 would be the best. think mines a 3 unless you count the 2 membranes as 1 each! but having the pre fiters helps membranes last longer.

 

[Posh]

So a 4 would do the trick? Cheers mate