Crust on Rear Unit lift cylinders

[rocketbud]

Every year we camp and go boating on Summit Lake in Indiana. Summit lake is a freshwater lake in central Indiana. We will rent a campsite along the shore and sleep in the boat over the Memorial Day weekend. We run the bow of the boat on the shoreline and tie to close tree with the rear unit fully up. We arrive on Friday and when we go out on Saturday AM there is a grayish crust on exposed cylinders. Some of the crust will come off when lowering the unit. But it will not allow the unit be lowered completely. I have taken a scouring pad to rub off the remaining crust. Anyone had this problem or idea as to where it is coming from?
We have a '92 Bayliner 2650 Sunbridge
Thanks

 

[Grub54891]

Without a pic, just a guess, is the water high in mineral content?

 

[Scott Danforth]

most likely a high mineral content.

 

[frantically relaxing]

Zebra mussel found At Geist means trouble:

A marina worker at Geist Reservoir hooked a Chinese mystery snail, an exotic species already prominent in the reservoir, while fishing recently, and on it was another undesirable species-an adult zebra mussel.

“That’s one invasive species colonizing on another,” said Doug Keller, aquatic invasive species coordinator with the DNR Division of Fish and Wildlife.

The find could signal trouble for Geist, much as the mussel’s presence has affected other waters.

Previously found in more than 65 bodies of water in 44 counties throughout Indiana, the discovery marks the first time that the mussel has been found in the Indianapolis area. Zebra mussels were also discovered last year in Summit Lake, the first population known to occur in Henry County.

--that may very well be your crust...?