We got the Brownchurch system and took it apart to mount it inside the landy as it was a bit cumbersome and the shower wasn't much use as you need two hands to operate it. We used a shower head with integrated switch.
The filter element snapped too, so we ended up replacing the whole filter unit with a Katadyn one.
The pumps are readily available from caravan outfitters and I suspect you could put something together that was more use for less.
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