Hey Z Driver,
Now, I am going to ask a question and I don't mean to be insulting, OK.
Did you wash the filter the last time you used it?
I only ask this because you asked "Do you get a new final filter every year or do you wash the old one?"
I wash all my filters, wool and pre-filters, everytime I use them, right after I am done. Well, let me rephrase that ...... my wife washes them!!
Again, not trying to insult you.
Dave
2x5 SS home design on a home design arch w/ forced draft
SS Evaporation Enhancement Unit
Home design filter / canner
Daryl Sheets filter press
300 taps (280 on line, 20 buckets)
120 gph Home Design RO
2017 Chevy Silverado w/ 275 gallon tank
8x16 sugarhouse w/ attached woodshed
A wife, family and friends that love to help!!