[heath verrall]

my filters came today, three in total  1= 5 micron 1= UDF carbon & 1=CTO carbon

What I need to know is can I use the two carbon ones  before my 40 40 RO?

OR do I need to use the 5 micron & one carbon?

Ive only ever had the two 2 pre filters one 5 micron & one carbon,, would it be better to skip the 5 micron all together and just use carbons