My version of intank Rex Grigg reactor is in and all that is left to do with it is the plumbing. Before I do that I must build the sump filter as it is going to use the returning water.
I built the reactor using strip of 3.5 inch glass siliconed to the rear corners of the tank. This gives an area of the triangle formed equivalents to the cross-section area of a 2.0 inch diameter pipe. As I would not like my fishes to enter the reactor, I have put a screen over the outlet which is merely a 1.0 inch hole. I made the screen out of the intake grid of the pumps that I had adapted for aquarium use. The pumps that I use for aquarium are not on aquarium supply list, but are manufactured in India for general purpose and have a ceramic magnet, therefore quite safe for aquarium use and also economical and long lasting (I don't know why aquarium goods are overpriced). I cut of the excess and then used epoxy putty to form the base. Silicone does not hold on to plastics but does hold epoxy putty well.
For the top, I took measurement after placing the 3.5 inch strip in place. Actually made a template out of thick paper and then cut the glass accordingly. Drilling a hole in a small piece of glass needed some helping hands to hold the glass. I siliconed this to the top of the 3.5 inch strip and left it overnight to cure.
I fitted the inlet pipe (which went in tight through the hole in the triangle glass) and fixed it with synthetic rubber adhesive using rings that I had sliced out of a socket. I wanted the pipe to end high up in the reactor so that the water current can scrounge the CO2 bubbles that manage to rise to the top of the reactor. I made a hole on the elbow fitting for the top and inserted a gas pipe down to the mouth of the elbow. This should place the gas pipe end close to the mouth of the inlet pipe of the reactor, a natural venturi point, and I hope to get a lot of small bubbles out from it when in use, although that not matter much in the Rex Grigg type of reactor.
I hope all of you appreciate the visual result despite the bad photography.
[attachment deleted by mean old server people]