I am new to the forum but i thought I would give some input to the cascade filters with regard to the bypass they have.
I went to the hardware store and got some 1/4 inch weather stripping and stuck it to the top outside edge of the top basket to fill the gap and this has stopped all bypass.
I went to the hardware store and got some 1/4 inch weather stripping and stuck it to the top outside edge of the top basket to fill the gap and this has stopped all bypass.