5 micron filter

[Bricklayer]

I have a big blue 10" x 4.5" ( filter size ) on my RO as a pre filter. Seems pretty hard to get a full 5 micron filter for it. They all seem to be dual density with the 4.5" filters.
The ones I can order in bulk are

25 micron outer and 1 micron inner Or
50 micron outer or 5 micron inner

Both prices are comparable couple bucks each.

I'm leaning more towards the 50 micron 5 micron. The 1 micron might plug up pretty quick on me I think.

[Bricklayer]

Just bumping this up to see if anybody has any input on this filter.

[MT Pockets Producer]

https://www.amazon.com/gp/aw/d/B0110LUF6Q/ref=mp_s_a_1_38?ie=UTF8&qid=1486555259&sr=8-38&pi=AC_SX236_SY340_QL65&keywords=10+x+4.5+water+filter