Fresh2o
Aquarium Advice Addict
I'll be building an up flow with pea gravel as the primary media and perhaps some dollar store scrubbers up top, but I'm thinking I may go all gravel with some heavier stones on the bottom transitioning to the pea gravel and then maybe some lava rock for additional surface area. The bottom of the filter will have water entering flowing opposite each other in a cyclonic fashion before it transfers to the media.
I'm also heavily considering doing two separate stages of filtration- 1 barrel with nothing but gravel for mechanical and an additional barrel with nothing but bio media.
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I've done multi-layer setups before and not mixing them while hosing out the media was always a challenge.
Regarding the use of gravel for a mechanical filter, while it will trap a good deal of waste, cleaning it thoroughly might be tough. You'll need a shovel and a strong flow from a garden hose. You may find pot scrubbers or similar material easier to work with. Also, for loose media such as pot scrubbers, bio balls, etc you can put them in a mesh laundry bag for easy removal. To clean them, just raise and lower the bag several times then flush the chamber.
I was going to suggest a vegetable filter or just some floating plants on top of either chamber but not sure how well it will do with in the shade.
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