Hello shillamus,
Yes a water culture system submerges the roots in aerated water. But the key word is "AERATED." Air bubbles wont penetrate the rockwool cubes if their saturated. Think of it like this, when you let the water drain out of the rockwool cubes it gets lighter right? That's because water is heavier than air and as the water drains out, air takes it's place. If the water doesn't drain out, air can't take it's place. Thus suffocating the roots because they can't get enough air.
Those vinyl fence post tubes are nice, but expensive. About 4 times more expensive than ADS tubing. You can also get larger diameter PVC and sewer tubing at pluming supply houses. If getting a large diameter tubing, I would get thin wall tubing. It weighs less, costs less, is easier to cut, and still strong enough.
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