what could cause skimmer to suck?

actually, soaking it in vinger sounds like a good idea. i do have alot of coraline buildup.
 
So i did the deep cleaning on my skimmer. still, it seems not to be working that great. not that much dirty skim.

my pump is one of those ones that i have to hit to get it started. Is it possible that my pump is weak and i just need to buy a new one?
 
either replace the pump or replace the impeller.
I just ordered new impellers for all my skimmers, they really only last a couple years. Think mine now has 4 or so on it, so not a terrible expense.
 
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