Thanks @lorby.
Currently, using one siphon tube and the levels as pictured, I've measured around 700 l/h from memory.
I've only got around a 100mm drop from the current water level in the overflow to the siphon break on the back, so sitting 30mm lower as designed would have the potential to run a fair bit faster. The higher the water rises in the overflow, the faster the siphon drains so it auto adjusts (within limits) to match the return.
Lowering the intake and the siphon break on the back would also increase the available flow rate, so the basic design can easily be adjusted to accommodate what you need.
I have a ball valve in the outlet, and slightly closing that cuts a lot of noise. It will completely silence it, but if you push it too far any blockage will limit the flow.
I'm going to put a cap on the siphon break with a hole drilled in the top, which is suppose to cut the noise level. If it does, it should be pretty quiet.
Currently, using one siphon tube and the levels as pictured, I've measured around 700 l/h from memory.
I've only got around a 100mm drop from the current water level in the overflow to the siphon break on the back, so sitting 30mm lower as designed would have the potential to run a fair bit faster. The higher the water rises in the overflow, the faster the siphon drains so it auto adjusts (within limits) to match the return.
Lowering the intake and the siphon break on the back would also increase the available flow rate, so the basic design can easily be adjusted to accommodate what you need.
I have a ball valve in the outlet, and slightly closing that cuts a lot of noise. It will completely silence it, but if you push it too far any blockage will limit the flow.
I'm going to put a cap on the siphon break with a hole drilled in the top, which is suppose to cut the noise level. If it does, it should be pretty quiet.