yellowish white puff balls on my LR??????

[xtreme]

I'll try go 2 for 2. Check out a pineapple sponge.

[MEDHBSI]

your good yea thats what they look like nuke em or keep em?

[mike31154]

I'm fairly certain most any sponge is desireable, they're filter feeders and help keep your water cleaner. I have two or three that I can see in my system, I'd say there are probably more that are not visible, tucked away inside the rockwork.