It seems to be pretty common in the new fish pro you are like the 4th person to post this issue. It is carbon dust slinging out of the carbon seal as the driveshaft spins. There is some controversy whether this is normal. One poster had a premature carbon seal failure that led to the ski taking on water. My ski is a 2012 and I don’t have a spec of dust in my bilge. I believe wherever they are putting the fish pro together (Mexico) that there engine alignment with the pump procedure is suspect causing premature carbon seal wear. If it were my ski it would be going right back to the dealer.