I've read numerous threads regarding your use of lava rock, Leafmite. Curious... do you just buy lava rock like you'd get from a big box store that some folks use for landscaping? It was one of the filter medias folks used to use in pond building a couple decades back. Only drawback from a filtration standpoint is you'd have to refresh it at least yearly because the pond gunk would get down into the holes.
Also, and knowing different climates thus different culture, but how often do you need to water using lava rock as a medium? I'm thinking about a spring project for outdoors and gathering some different medium ideas.
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Caveat: Everything suggested is based on my environment and culture. Please adjust accordingly.
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