I have very little money, and am building a large wicking bed. After my liner got a couple of holes in it, I had to take it apart and rethink. I was wondering about burying gravel filled buckets with a PVC pipe to each. Would these have the same effect as one larger layer of gravel, or one large container full of gravel? I am not including overflows, because I will put a float in the pipe to let me know when it is full, and if a little overflows, it will not be a disaster.