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I went to Lowe's and got a 170 gph pump made for pond fountains, etc. and it works extremely well, and only cost me 21 bucks plus about a dollar for tubing. That's a good deal, I'd say. The only downside is that it only pumps out the water till there's about 1/2 inch left, so you've got to finish the rest with a syringe/turkey baster as the above guy said. Luckily, I use syringes to measure out my nutes so it's already available. I saw the necessity of pumping out the buckets when I began to get scared of buds breaking off of my plants when taking them out of the closet for res changes. Definitely not feasible anymore with such big plants.
Rush Limbong has found the ultimate res draining tool; its called the Python "no spill". It basically attaches to your sink faucet so you can drain and fill your DWC tub with just a switch of a lever.
It comes in models of 25ft, 50ft, 75ft and 100ft. It also has a 10ft and 20ft extension. Its kinda expensive so expect to pay around $35 for the base model.
I just noticed something. The python no spill is almost identicle to a waterbed fill & drain kit. They both use a venturi pump to drain a body of water, but the waterbed fill & drain kit is only 7 bucks on ebay.
These guys are right. The aquarium fill/drain tool works great. Only drawbacks...1. Nutes go down drain vs outside to garden. 2. Requires you to run/waste your own tap water when draining to "suck" the water out your res. Dont STRIP the fittings that go in the Faucet!! 8 bucks to replace a small fitting
I just noticed something. The python no spill is almost identicle to a waterbed fill & drain kit. They both use a venturi pump to drain a body of water, but the waterbed fill & drain kit is only 7 bucks on ebay.