From the picture, I can't tell where the last two baffles are (the two that make up the 7.250" section). If they are both touching the bottom, then that is just wasted space IMO. Both are on the bottom, what do you suggest would work better?
** You want an over - under flow of water. The way it is set up now water is just going to be going over and over, meaning that there will be all that undisturbed water that isn't on the surface of that section. Granted there will be SOME water movement, but the large majority of that area will be nearly-stagnant. To correct this, have them put in a suspended baffle (just like the left vertical piece of the drip tray) to the right
of that last baffle. That way water will have to go under that suspended baffle before going over the final one, giving you some better water movement in that second-to-last section.
As far as the drip tray section goes, the section will be under water (most likely) up to the height of the 2nd to last baffle (the one that says "we may need to add holes", although it may actually be the last baffle depending on heights). If that is the same height as the top of the grating for the drip tray lid, then the bio bale will be completely underwater. If there is a difference in height, then that difference will give you some media out of the water, giving you a better "drip" action. Yep on bottom, what do you suggest I have them change?
** If you want to keep that drip tray, just make sure that there will be a height difference to allow for the drip to work properly.
Thank you for your help, it just annoying all these things you point I out which is great, I would thing the guy coming up with how to built it would take it into account as well, since they do this every day for a living.
** Any time. If I'm missing something, hopefully someone will jump in as well. You have to remember that these guys usually do SW setups, which require some different designing.
: Now that I think about it, you might be able to go without that second-to-last section (7.250"). What were you planning on putting in it?