It is 100% a 0.1 micron filter,costs about 70 quid at cost trade price! if i remember,so yes your right would not be worth it at diy level but i get full backing from company who makes them(prob same place you buy from) They wanted expensive filters testing on wvo and bio,we did the testing they provide the filters.
And it was not a pleated like i said it IS the membrane filter,I can prove thats what ive used if you really need me to i will have to have confirmation email of this from suppiler.
It was done as a progression from all the different filter set ups we have tried,starting at the basic 20,1 micron that most use then on to 20,1 0.5 ect ect ect
tried these sorts of set ups
20 spun,1melt,1melt, 0.5,spun
20 spun,1 spun,0.5 spun
20 spun 1 spun 0.5 spun 1 spun
20,spun ,1 melt,0.5,01
20 spun,1 ,spun,0.5,0.1
20 spun 1,spun,5 carbon duel media filter,0.5
The vegforum was where all the results are,its really heavy going as it got to something like 46 pages, of reading.
The problem was as it was a masive thread it was hard to read and get info from,got quite a few digs about it was a waste of time ect ect ect.but hey the guys who make the filters were only trying to see if any improvements can be made on the way it was done in the past.
Iam not saying you need to go as low as 0.1 at all,it was just for experement purpose anyway,we didnt know what it was going to do to oil,so whay not try??Thats how you learn....
maybe the 0.1 will remove more bacteria and nastys chemicals ect,and maybe the other filters we use remove more carbon.
But what ever,its made the oil better in cold conditions,much clearer
as for going to 0.5 we noticed that was still good in freezer tests,but better preformane when driving,I would say your find it hard to beat 20,1,0.5 on that.
At the moment i only pass through filters once,no real need to pass again,we did it just to see on the standard 20,1 filters and that helped quite a bit.
20, and one micon oil is fine for use,i have used this for years in the past with no probs at all. Cant see me ever dropping the 0.5 and 20,1,0.5 maybe how iam going to use it in the futur when 0.1 blocks up
Not sure i want to post to much on here about this,hope you dont mind but ive spend hours thashing out the pros and cons,Iam no way saying you need to go this mad or we have re invented the wheel but we have made progress all the same.
would prob be best to keep to topic of the fantastic for terrano,sorry my head hurts...cant go though everything we have done :thumbs