Easy, cheap, cold, aerated, and co2 enriched.
So I have a two bucket 5 gallon each recirculating system. It is aerated normally, via a GH dual diaghram pump with 4 outlets. However im sure some have done this but I found I would aerate the water at the same time cooling it also further. Place the pump outside! Get a box made though to protect it. Snow, rain, etc.
1 Outlet leads to the controller bucket which sits outside of the tent. Inside a pre soaked 4 inch round airstone is attached and pump opened.
The second, runs from the pump to the 5 gallon grow bucket inside of the sealed tent and enters the bucket through a hole drilled atop, which is also connected to a pre soaked 4 inch airstone.
The third line however, runs from the pump, to the water feed line. A barbed threaded nipple is pressed into the feed line and is thus attached. Pump is turned on 1/2 turn.
All of this for a lot of us in colder climates can use this method not only to aerate, but to cool their water like a chiller.
The water pump sits in the controller pumping out to the grow bucket inside the sealed tent.
Make sure your return is of larger diameter tubing then the feed.
Pump the water through the feed hose which you have attached the barbed fitting to into your grow bucket and I suggest a stern system. Something that would be stable. Trust me. Top feed of course. Adjust air pump to desired ridiculous aeration. Its too violent maxed out.
Sealing your tent is important. Please note using co2 in any form is useless unless all variables are in place. I don't like to use the term maxed out. But its simple. RH you want below 60%, Temp you need between 28-37, ppm greater then 400 of co2.
Co2? Bottled costs a fortune but if you can do it. Fermentation. Don't do this yeast sugar deal. This system is MUCH stronger. I'm not selling the product so I wont say names ill post my pics and you do your leg work.
Presto, solution is prepped.
The bucket lid is sealed. Tube runs out into catch can bubbler and routes up to the back of your fan. You need ALOT of circulation. Not going further into detail.
Keep your shit in check, and read about co2 and nutes. Im at 2.2EC. and going to 3.2 tomorrow. No burn.

This was a quick write up. Was it worth anything?