The first pond I ever built for myself was made without any fancy equipment as well. I did not even use a UV light. I pumped water from the pond into an upflow gravel filter and that flowed back to the pond via a small water fall. It took six weeks for the water to clear.
My systems at the store are three thousand gallons each. I pump to an Ultima II 6000 then the water goes through a 40 watt UV light into a trickle tower and back to the pond. They never went green.