the most important thing about this is that all of your containers are leverl with each other,other wise some buckets will be higher than the rest and it wont work right,basically your going to flood your shit.its verry simple though and this is a list of things your going to need.
1.another container exactley like the 2 that u have now.
2.a small water pump like the active aqua 160 gph"for a 15 gallon rez"
3.lets say 15 ft of vinyl 1/2 tubing "get the stuff from the hydro store its super flexable and wont leak,its abou 25 cents a foot.
4.about 20 ft of 1/4 vinyl flexable tubing also at the hydro store.
5. 2 half inch t fittings
6. 2 half inch on off valves
7.4 half inch grommets for the t fittings and on-off valves also at the hydro store.
8.a drip manifold,since u have only 2 buckets u can pick up the 4 head for a couple of bucks at home depot.
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--------------- now on the 2 containers that u have, drill a half inch hole out of the center on both at the bottom of the container.u want the valve to almost be at ground level.install the 2 gromets"use spit to slip them in".
--put the 2 T fittings into the container
--.make sure your containers are spread apart the length that u want them.this will be the length of your tubing your going to cut and attach the 2 together.u should now have one exposed end on each of your t fittings.
-----now with your new container drill 2 half inch holes side by side about 2-3 inches apart,these also need to be drilled near the bottom portion of the container,u want your holes 2 be the same heighth as on your 2 first buckets.
---install the 2 gromets and the 2 on off valves.
---take your remaining 1/2 inch tubing and cut it in half.
---attach your tubing,from one on/off valve to the first t fitting,the buckets have allready been attached 2 each other in the first step.
----take the second piece of tubing and attach it to the last on/off valve.
----connect this hose to the only t fitting left.
----if u did this right,u have 3 containers linked together by tubing forming a circle.
----now put your water pump into the new bucket
----attach your drip manifold,
----attach your 1/4 drip tubing to the manifold
----cut a verry small hole into the lid of the new container"big enough for your 2 1/4 lines to poke through.
---- pull the lines through the lid and put one into each container.
----make sure that the water pump is close to the on/off valves.it will help draw the water from the other 2 buckets.
----start filling the new container with water,all of your buckets should keep the same water level because they are all conected.if there not your system is not level.u need to fix this before u turn it on or your going to flood.
----turn the pump on and watch it for about 20 min,looking for any leaks and to make sure that the water levels are not getting any higher than the new controller bucket....one thing i would do is keep the controller bucket outside of the grow room.if u would like 2 make sure its working right u can add food coloring 2 both of the grow containers and see if it ends up in the rez"this will also allow u to tell how long it takes to refresh your buckets with recirculated fresh water..... im sorry if this is really jumbled up but i hope it helps and isnt to hard to follow.my speach and people skills are kinda funky ohh and one last thing,keep the manifold in the bucket,incase it leakes"they all do"this way your leak is contained inside the controller....welllllll good luck.this shouldnt take more than a half hour to assemble.hope it works out for u .