I have read of alot of ways to drain and fill the bubble buckets and the solution that fits my needs the best would be having a pump do the work instead of gravity. I have read alot of people say you aqurium or pond pumps. The problem i am running into is most of the pumps say they are submersible. Seems like alot of people are using the EcoPlus 185 water pump. Some websites do say it can be run inline. Does anybody have any expirence with this, or maybe point me in the right direction? I want to be able to connect a drain hose to the bucket, drain it into a empty bucket, and refill bubble bucket with nutes again with out having to stick a pump into the bubble bucket.