Plastic parts and light fixtures (not completed in this pic)
The growth chamber is made of clear polycarbonate and it almost completely indestructible. It has guides molded in for the false bottom (shown in pic above) as well as a barrier separating the main area of the Growth Chamber from the Emergency Drain section. I will also be producing snap-on extensions to this barrier for enhancing 3D growth. The seal extensions have glands (grooves) for holding a total of 4 heavy duty o-rings (3/16" diameter cross section) which provides a dual seal on each drain to ensure no leaking past the seal. The dual o-rings also serve to keep the growth chamber positioned straight up and down within the base for a perfect fit, every time. A small tube of silicone grease (reef safe) is included.
The bottom of the main section of the Growth Chamber has a draft to it, so that when you shut off the water flow in preparation for cleaning/harvest, the water will not pool on the bottom and then pour out as you maneuver the Growth Chamber out of your sump area. This means you don't have to worry quite so much about holding your hand under that drain extension.
In the above 2 pics you will notice there is a strip of velcro attached to the ends of the Growth Chamber as well as to the inside of the End Cover Plates. This is due to one of those "well, that' didn't turn out exactly as I had hoped" type of things: the End Cover Plates don't lock into the Heat Sink Groove in the base and at the top of the J-channel just quite right. To fix that, I am having this part redone with an offset tab to grab the edge of the J-Channel. Everyone will receive this replacement part when it is ready. Until then, the velcro works to hold the End Cover Plate in position and it is not difficult to remove and replace.
Here is the underside of the Base - it has ribbing added for structural support against flexing. The ABS may be drilled to secure it to support braces with, for instance, zip ties or nylon thumbscrews.
The base with J-channels bonded in place (comes assembled) showing the Growth Chamber removal access hole. Generally this is not needed, but if you forget to keep the o-rings lubricated or a suction develops between the o-ring seal sections, you might have a little trouble getting it to initially release. Placing your thumb on the edge of the base and pushing up on the growth chamber from below easily breaks the seal so the growth chamber can be lifted up and slid out the end
The pipe extensions match 2" PVC pipe dimensions. Included are (2) 2" x 1.5" slip/slip adapters which can be friction fit or solvent welded (again, using transition cement with no primer applied to ABS Base)
The emergency drain (on end) only need a section of 1.5" pipe extending down to the water level below the unit (just above or no more than 0.5-1" below the water surface). The primary (center) drain will have a valve (not shown) and a detachable bubble blocker. In the past, I used a filter sock hung from the drain handle but this doesn't work extremely well, so I came up with this simple method using a 2" coupler with tapped holes for thumbscrews and a drawstring filter sock (all included)
You cut the pipe to length such that the end of the 1.5" pipe is below the water surface (at least 0.5" but not more than 1" - so that it pulls a siphon) then you tune the drain to a full siphon (outflow matches inflow) in order to silence the unit and reduce bubbles (bubbles will be reduced significantly as the screen matures). Then you slide the bubble blocker over the drain and tighten the thumbscrews and cinch the filter bag over the adapter. You can pre-tie the bag so that it slips over the thumbscrews wit little effort, but it won't fall off on it's own.
There are tons of little details put into this design and I'm sure I'm forgetting many of them!