The noise problem
1. Try extending the drain pipe below the water level so it wont splash
2. Flexible drain hose is making upward loop rather than pitched downward continuously. That loop is whats causing that surging action. Loop collect water for while and discharge then collect and discharge.
YOu may want to play with flexible hose or get 2' flexible drain hose.
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The video shows that your pump chamber is too low where pump might be sucking in air. Not a good idea with pump.
With Sump system, only water level that drop due to evaporation is in pump chamber (last chamber before the pump).
Try adding some water to tank. You will notice that ONLY water level in the pump chamber will increse.
Remove some water from tank, eventually water level will decrease ONLY in the pump chamber.
That last chamber ( I think it is very small chamber) is only area where the water level will fluctuates, not in the tank nor any other chambers in the sump.
You have to keep the water at decent level so it can handle evaporation fro while but make sure not to keep too high for sump to overflow in case of power failure.
You can look into Automatic Top Off (ATO) system which can help you with constant filling of sump to compensate evaporation.
I mentioned cover for entire sump. Cover will definitely and drastically minimize evaporation, not to mentioned prevention of unwanted pollutant into system.
You should have foam in the Overflow Chamber. Whenever tank gets mulky, you can substitute that foam with TEMPORARY (couple of hours depending on amt of dirt)MICRO FILTER PAD. This will help you improving or removing dust particles.
As foam in the Overflow chamber gets dirty, water level will increase in the Overflow chamber causing water level to drop in pump chamber thus should clean out the foam regularly.
I know it isnt easy at first but I know you will eventually figure all out.
God Luck
