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I ran a lava rock "shower tower" for three years in a tank containing 600 gallons of water. I used a 1200 gph Pondmaster submersible pump mounted 8" off the bottom of the tank with 1-1/2 inch pipe running from the pump up through 5 commercial grade plastic drip saucers. Four of the saucers were 21" in diameter and 2" deep and each contained 1/2 cubic feet of lava rock. The top saucer was used for water disbursement. Three of the saucers had 3/8" holes drilled in the bottom and the last one had the holes around the outside edge only. I had excellent water quality with heavy fish loads for the entire three years.
I tore it down and traded the lava rock in two of the saucers for bio balls and ran it that way for another 3 years. It still performed well.
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Gene
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