Slime, Weeds, Zebra Mussels, slower sailing, staining, embarassment, confusion, dizziness, palpitations, shortness of breath, lack of libido, genetic confusion, dismemberment, decapitation, ostracism, schizophrenia, loss of liquidity...
Sounds like the interior of my underpants!
Oh...and thanks for the mention of the dreaded Zebra Muscles in the intake. Hadn't thought of that one! I'd like to think the strainer would catch them but I doubt it would catch them all.