Chris,

The Deere filters are an annual purchase, use, dispose of deal. Very effective, but very $pendy...

The Dutch filters use a 'frame', then you buy the activated charcoal in a bag. Load the filter frame and install. At the start of the following season, change out the charcoal - (C$70) for the last box I bought - and carry on.

If Dutch make a filter for your application, Highly recommend the system. The mothership at Exeter will either have them or can order. I know they stock the charcoal.

Ken