I'll look into some possible cheap setups for around $50-$100 or so tonight using materials you can use on other projects if it doesn't work out. A trash pump can work I'm sure but you still would need to create either some sort of holding pool to let the sediment fall out of the water or a filtration system. I would stray away from using a water driven pump as it almost always has an impeller of some type and for suction purposes even muck/sand will start to mess with the internal bearing and seals leading to premature wear. That water depth is going to be troublesome for a true airlift(However we have used them in as little as 4' of water but we use very large roto-screws like Ingersoll Rand 375 XP's: Which can put out around 300 to 400 something CFM).
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