If your septic bell and syphon type dosing chamber seems not to be draining periodically, maybe there is a lack of air under the bell. I got this hint from: https://www.onsiteinstaller.com/online_exclusives...
Remember that you are dealing with septic waste. You may want to be wearing a face mask, protective gloves, and clothing you can wash immediately after this process.
Never enter the septic tank!! It can be filled with gases that do not support life, meaning you could die.
If the procedure does not work for you, then call in a professional as there must be some other problem with your system.
2 m 1/2" poly pipe
10 cm 1/2" poly pipe
2 plastic elbows to fit the poly pipe
20 mm X 20 mm approximately 2 m long wooden stick
electrical tape and/or nylon ties
Portable compressed air tank
Blowgun accessory for the air tank
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Step 1: Make the J-shaped Jig
Tape or use nylon ties to fasten the tubing to the wooden stick that acts as a stiffener. Nothing critical here; you are simply stiffening the poly pipe.
Add one of the plastic elbow fittings to one end of the poly pipe Add the short length of poly pipe to the elbow Add the second elbow to the short poly tube and ensure the elbow points up to make the J shape
No clamps required- just seat the pipes well. You should now have a J-shaped device.
None of the dimensions are critical other than the jig must reach from the bottom of your septic chamber with its upper end outside the tank.
Step 2: Go Fishing
If your tank has not been dosing, the bell will be under the water surface, hence the fishing reference.
Remove the dosing chamber lid and use the curved end of your J-shaped jig to fish around for the lip of the bell. Your goal is to have the short side of the J tuck under the edge of the bell perimeter. The bell under-edge is about 10 cm from the bottom of the chamber.
Use an air carry tank with a blowgun accessory, preferably with rubber tip that fits snugly in the open top end of the J pipe. Put the tip of the blowgun in the top of the J pipe and give as short a blast as you can. If the short arm of the J is not under the bell, you’ll get bubbles in the liquid.
If the short arm of the J is properly positioned, there will be no or few bubbles, and you’ll hear a short gurgling noise from the overflow pipe, followed by the sound of the water dosing into the septic field.
The level in the tank will drop quite quickly (unless there is a blockage somewhere in the connection to the field or in the field itself). For my tank, it took less than 5 minutes until the water level had dropped below the bell edge, and I heard the air rush in to refill the bell.