Help deciding on water pump type for potable water transfer

[bubba slapbum]

I have a Berkefeld gravity pump, which I keep under the bed and as such it is cumbersome having to lift it up and out every single time to get enough clearance to put the other container under it to empty it. No, there is no where else to put it or I would have done it!

I have had the idea to get a pump at the tap of the Berkefeld so it can then stay underneath and pull the water from there and simply have to angle a hose into the top of the other container.

Currently undecided on the most suitable pump though. The cheapy submersible pumps I gather I would have to place inside the filter chamber of the Berkefeld. This is possible and saw some nice little fittings which may allow be to take the tap off completely and have a sealed pipe there instead. The problem though is that the submersible pump would also require a wire for the electrical current run inside that chamber and I can only think that I would have to run it in between where the top raw water chamber and the bottom chamber of the water filter meet. It might work but they are made to form a seal - not airtight I am sure but still be flush with one another - which would mean putting a wire in there would cause it to pinch.

So submersible doesn't seem the most practical solution.

The other ones seem to be diaphragm which self prime outside the water source, so this looks like it might be a better option? Why are these types much more expensive though for much less LPM liquid transfer? Some chinese cheapies are comparable but mostly the cheapest diaphram runs about £50 and only 6 or 7 lpm while the submersibles you can get 20LPM for about £20.

From the design it looks like the diaphragm ones are inline with the water pipe, so that means I could leave the Berkefeld alone and just make a pipe connection at the tap and have a diaphragm pump inline between the Berkefeld and the container. So would this be more suitable?

I guess it would be possible to find a way to make the submersible ones work, maybe having a third intermediary where it could be submerged but the diaphragms seem to be the functionality I am after - to run dry without damage while it sucks up the water from the source from what they list in their features.

I won't post links as it will probably send my post into moderation - which might happen anyway as a new user, lol, but one can look up each thing I mentioned and see the designs of each.

You may say I can buy the all in one filters reverse osmosis and pump blah blah but I looked into that and far more expensive and wastes loads of water in their operation. The Berkefeld works just fine, and I already have it, I just want to streamline the transfer process.