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Thanks for your feedback! I’ll go back through the book and make those sections clearer.
Let me explain these biofilters in simpler terms:
- Small Biofilters: These are less than 3 meters (about 10 feet) long. They work well for small setups like backyard systems.
- Medium Biofilters: These range from 3 to 6 meters (about 10 to 20 feet) long. They are the most common size for medium-sized operations.
- Large Biofilters: These are longer than 6 meters (20 feet) and are used in large commercial setups where more filtration is needed.
You can choose whether or not to include a drainage pipe inside the grow bed. Here are some things to think about when making that decision:
- Sand Type: If your sand drains quickly, you might not need a drainage pipe. If it drains slowly, having an extra pipe would help.
- Slope: In a 6 meter grow bed, the shallow end is about 30cm deep, and the deep end is around 42cm deep. If you can’t achieve the right slope, extra drainage may be necessary.
- Experience: If you’re new to this, it’s a good idea to minimize potential issues by following the suggested guidelines.
We previously discussed using a slit drain, which is a great option for draining water because it pulls water sideways instead of pushing down on the sand. It also helps oxygen get in, drains water faster, and looks nice.
I really encourage you to stick with the slit drain. If you’d like, you can send us pictures, and we’re happy to help. If it were me, I’d cut a slot in the cinder blocks with a grinder, secure them with concrete, and cover everything with a protective liner.
Thank you once again for bringing this to our attention. If you or anyone else has any further questions or needs clarification on anything, please feel free to reach out to us.