Why don't you have a quick google before making stupid comments?
So my Ro came from pure freedom and standard 3 pre filters. When i bought the diy system it came with a box of spare prefilters but I learnt about the fiberdyne filter and have been using them as well. So sediment filter, carbon block and then fiberdyne. Yes I understand its over kill but I had a stash of spare prefilters to use.My water pressure by the time it has gone through the prefilters is down to 34psi and so I use a booster pump before the membranes.I have been using fiberdyne for the last year, I don't use prefilter at all I have no sediment in my water even though it's high Tds my prefilters always look brand new when changing so now don't bother, but if your unsure I would suggest using one.Now im sorting my RO and taking off the three Chambers and just using one seperate chamber with a fiberdyne filter instead. I know they do the job of all three filters but this will be the first time im using just the one filter and wondered if anyone else on here is doing the same. Just one prefilter: fiberdyne and then the RO? How have you found it to be?