My instinct (without having tried it yet) is that you might begin with the pump etc close to the height of the CCD but when the flow is established, the syphon effect would tend to keep it going so you could then lower the pump etc to somewhere on the mount of whatever. That's my untried hope. Note I didn't say 'expectation'. As with all things DIY, a certain amount of 'suck it and see' is usually involved.
Peter
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