By Bob Goemans
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Bob Goemans corresponds with Tim F Brassil III (Amsterdam)

Tim F Brassil III (Amsterdam) writes...

Dear Bob,

Thank you for taking the time to read this. I am writing to you from the Netherlands. I have been making the plenum sand filter all completely out of eggcrate with a void space of 1/2 inch, 1 inch & 1-1/2 inch base on what my customer want. (I hope this is all right?) Lately I have been asked to make them with a 2 inch void space. My question is it ok to make it for them at this size?

The other question is in regards to your books. I would like to offer all of your books as part of an aquarium package that I plan on offering in about 3 to 4 months time. How do I go about purchasing them at a reseller price?

Kind Regards,

Tim F Brassil III


Bob replies...

Dear Tim,

Thanks for your letter and as for the depth of the void space, I've probably made 200 - 300 grids of all sizes since 1991 when I made my first one! Past experience has shown the best void space is as follows; for aquariums less than 100 gallons, I recommend ¼ inch high legs. For 100 to 1000 gallons, 1/2 inch legs. Over that, ¾ inch legs. Larger than that is simply a waste of interior height space.

Actually, when one fully understands the involved Jaubert processes, the depth of the void space is of far less importance when it comes to the correct sand grain size and its depth/on-going proper maintenance.

FYI, custom-made grids are again available as the company that use to make them about 6 years ago is again in business, as the owners health is again much better. His name, if interested, is Todd Schwarz, and he can be reached at,

As for my booklets, I will forward part of your letter to the company that distributes them, and they will contact you.

Hope this helps.




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