Herbie overflow tuning

[sphelps]

Relating to 3 in my previous post, what's the green stuff with the pump?

Also the return chamber is pretty small, you'll have to do the final tuning once everything is at equilibrium (overflow water level and sump water level at permanent state),

[mrhasan]

Originally Posted by sphelps

It's probably one of three things

1. Operator - improper adjustment, it can take a bit to find that sweet spot, you can sometimes adjust it close to the point walk away only to hear it slurping air a couple minutes later. Then you over compensate in the other direction, always missing the actual point.
   
2. Air draw - flow rate is too high for primary pipe in overflow height. The higher the flow rate and the smaller the pipe diameter the higher the intake velocity. The higher the intake velocity the more space you need from the top of primary pipe to operating water level in the overflow. If the space is inadequate you'll gnerate the occasion vortex with brings air into the line which messes up the flow rate.
   
3. Inconsistent return flow rate - a few things can cause this but your return pump has to pump a consistent flow rate. Obstructions at the pump intake, air bubbles, poor quality pump are all examples.

1. Operator: Yah that might be the issue; I tuned it yesterday evening and it was remaining at the same level for about an hour. Afterwards, I left my house and didn't check back yet to see the level. Will be checking it after an hour or so when I go back home.

2. The overflow is silent and no bubbles can be seen from the output. But slowly, the level goes down (draining more than return I presume) and then the gurgling starts till I readjust it.

3. Its the speedwave 790 running at 3th speed (or 4th; can't really remember ).

Originally Posted by sphelps

Relating to 3 in my previous post, what's the green stuff with the pump?

Oh those are foams. I used those to temporarily raise the pump since, because of my mistake, bought inadequate amount of clear pipe. Will get a longer pipe, hopefully today. Also removed the foams the last time I have been to my house.