Cherib603
Chirping
Lava rocks give off a lot of dust into the filter and there are much better filter materials such as floor scrubber pads. Seriously, search Skippy Filters and click on the Skippy company site. They explain everything. 

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I am not involved with 4-H, but we have it in our county. I didn't even know what it meant until I read your profile diddy, whatever you call it. I AGREE with you! I am also a believerIf you see in any way unhealthy water i would start to filter it.
This is a rather dry explanation, but bear with it as it explains things very well
Lava rocks were commonly used years ago because there weren't better materials available' but they are heavy and dusty and difficult to clean. A simple skippy filter using floor scrubber pads - which are cheap, plentiful and light - seems to be the way to go.