PH and water density/flow?

[banditpowdercoat]

I am still trying to figure out why my Coast to Coast Herbie changes in drain flow. Sometimes the level is high, then later, it drops to making a gurgling sound.

I was thinking it was temp? Hotter water in evening, less dense and would not flow as much in the drain. But, temp has been pretty much constant last 2 days and level stayed just at the drain level, making sucking noise. Other thing that I notice changes between day/night, my PH swings .about .3 between night and day.

Could the PH affect how water flows in a pipe?

[patpare]

The only thing i can answer is regarding you P.H drop,this happens when you lights go off,solution is lighting your sump when your main tank lights are off.

[sphelps]

If your salinity changes from daily evaporation your density will change which can effect flow. In addition if your sump level changes from evaporation the pump head pressure will change which will also alter flow. Herbie overflows are fairly sensitive and usually require an ATO to keep things stable.

Another solution would be to change the back up drain to a standard standpipe and adjust the flow so some water enters the back-up (standpipe) drain. This way if your flow increases or decreases slightly you will avoid annoying gurgling sounds. The overall noise will be slightly louder than a traditional Herbie but may be acceptable depending on your requirements.

PH will not directly effect flow.

[banditpowdercoat]

I have an ATO, Salinity and sump level do not change, other than with the level in the herbie

[Jason McK]

I believe Untamed had this same problem maybe PM him on his solution

[sphelps]

pictures of your sump and general plumbing setup would be helpful.