Nice, thanks for the link. The McMaster filter is identical to the Neptune other than Barb size. If it’s easy enough open I’ll try it on the Neptune. But now that I think about it surely if Hanna makes the discs they make the filter?To me its a better and cheaper solution though. No need to replace the whole filter assembly if it opens. You can buy 25 discs at a time for $8 and just replace periodically in the OEM housing.
https://www.hannainst.com/filter-di...E3uDMXP0Nk0tXbCQ1I3puLxvhWWcxM_saAnCNEALw_wcB