Gonna use the pumpâ?¦..would coco fallout foul the filters and pump?

Probably.
Though it's too soft to grind the impeller on the pump.

Not so for 'tron, with the endless red dust, and mini-cinders from lava rock will stop a pump dead.
Rinse the bejeesus outa dat L.rock, brah.
Nothin's perfect.

"Itâ??s gotta frost an experienced guyâ??s butt when he offers up good advice to a newbâ?¦..and it goes ignored."

Nope. Not at all.

No, "you betta b'lieve it!"
Mo', "take it, or leave it."
Offerings n edicts,
dey be different guys.
W'en 'em take it an use it?
An 'member from whosit.
An' give up some rep?
Well den, dat's beeg surprise!

Da weeze