Sorry to get off topic here but I wanted to recount my experiences with the CSP750MKII. The first one I put in ran fine for several months before the shaft seal started leaking and corroded the motor. It was very quiet sitting on foam. The DDC that eventually replaced it is about as quiet. I replaced the first CSP with another I already had, this one started out making a lot of noise from the get go. I was planning on leaving it in there till it failed but the noise eventually passed my threshold of annoyance and I replaced it with a DDC after about a month.
BTW the first CSP had a motor mount screw that was stripped out so the impeller was hitting the housing. CSP sent me a new center section (with motor and impeller) and I rebuilt the pump with that and had no further trouble until the shaft seal failed.
The system I had the pump in was sealed, no atmospheric air bleed. I think it's possible the temperature cycling caused the system pressure to rise high enough that it forced the coolant past the shaft seal. This may have aggravated the design weakness.
I would not recommend using the CSP750s. Get a DDC.
I've heard that C-systems is working on a sealess design, if they can get a reliable product to market at the same price point as the CSP750 they'll have a winner.
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