I'm in the same boat and ultimately just ordered a new Vertex pump (actually not vertex, it's Resun). The deciding factor was cost. The Tunze pumps (Hydrofoamer?) and Bubble blasters are good replacements but more dollars. I'd be halfway to buying a new skimmer with one of those pumps. The Tunze is apparently super quiet; there is a youtube vid for the mod. I've even heard of someone replacing their pump with with a Sicceand a bit of tweaking.
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