Phil Stevens wrote:. If I see "California" thistle (Cirsium arvense, also called Canadian, but it's neither...actually native to the Eurasian steppes) I destroy it with prejudice. This stuff is nasty, a perennial with a habit of sending roots up to ten metres long to shoot up new plants in clumps.
Kate Downham wrote:
I looked up 'biofouling' and that seems to make sense.
I asked a robot and it told me to take all the filters fully out of the system, scrub them with something very very abrasive under running water, and then re-prime them.
Sounds like a lot more work than my current scrubbing-with-bottle-brush-and-refilling trick, but I might give it a go and see what it does to the flow rate.