It’s time to install the water pump, do the wiring, fill water into the tanks and do a test run to check for the aquaponics system operation.
Currently I hit a roadblock in building this aquaponics set. First is the leaking issue. It’s like everywhere is leaking, due to my usage of silicon sealant at the pipe connection. I decided to use sealant because I couldn’t find suitable pipe fittings for the tanks:
there are no uniseal sold here, even the regular rubber seal only have size up to 1.5 inch.
bulkhead fitting is quite expensive, and I only can find it sold online
2-inch PVC tank connector doesn’t fit with 2-inch UPVC
Another issue is the low water flow from the water pump. This probably cause by the leaking at the sump tank connection, and also maybe because of the head height (2 meters). Water from the pump is split to the fish tank and DWC. Pipe into the fish tank is around 90 cm height, so assuming the flow rate decrease is linear, at 0.9 meter, the water flow is theoretically 1100L/hour. Adding the split line to the DWC and all the elbows turn that add friction to the water flow, the value might be much lower. For now, I let the valve at the DWC slightly open and at the fish tank fully open, but only little flow is coming out to the fish tank.
I changed the arrangement of the tanks, and solid filter drain outlet now connected directly to the sump tank, to reuse the water while filtering out the solid waste.
All pipe connections are glued, and the connection to the tanks are sealed using silicon sealant. This is far from complete, as I still need to do test run & check for any leaking. Also need to make sure correct water flow from the sump to the fish tank and DWC.