I cant believe that these pads wont block with leaves etc. You mentioned keeping the pads clear of the outlet, is there space for the extra fine grey pad you spoke of?
This is one of the best features of Matala media; they won't clog like foam does because the way the mats are designed means the water slows and splits. So materials like leaves drop off, rather than getting sucked against the surface. Unfortunately there isn't enough room to fit in any extra sheets.
You'd be surprised how easy it is to clean the sheets. Because they are bio-filters; full of live bacteria, you actually don't want to over zealous in the cleaning process. It's just a matter of rinsing and shaking debris free, then draining the water. Nothing excessive. You can find instructions on the easiest methods to clean them here: bit.ly/3QJ4h8R