05-16-2011, 12:33 AM
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Oh man, this is physics all over again. *shudders* I guess I should of written my question a bit more clearly: What are the benefits of having a gravel vac thats graded for 5-10 gallons versus one thats graded 20-30 gallons? The funnel/head of the vacuum do vary in size, but the tubing itself is relatively similar in diameter. I ask because whenever I'm vacuuming my sand, I can't get enough suction to get the poop/leftover food with my small 10 gallon rated vacuum unless I churn up the sand, but that's quite difficult to get all the spots that way. Hope this clarifies it!