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I believe it stands for Heavy Metal Axe!. Its a composite carbon/resin filter cartridge used for removing metals and other nasties from tapwater, a lot of discus keepers are now using it with great results.
Heres some blurb on it
Lead Reduction Based on NSF/ANSI Standard 53
Cyst Reduction...
If you are using HMA then it doesnt matter where the water is coming from the HMA filters will remove any metals. Mark Evenden has recommended this method on BIDKA and a few people use it :thumbup: . I've got a 500 litre discus setup and even for this size tank, storing enough water for my...
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