Well, I set up my first "Herbie style" drain.. Oh my God is it quiet! I tried a Durso first and was very disappointed with the results no matter how much I played with it.. I don't think I will ever do anything other than this unless I come across something better..
Anyways, on to the questions...
Is the "tuneability" if that's a word.. directly proportionate to the size of the overflow?
Does this make sense? For example.. Assuming a 1.5" drain, with a 1.5" gate valve, a 24" tall cube tank and a 12" tall, unrestricted at the top, drain pipe in the overflow.
If the overflow measures 7x7, you have 7x7x12=588 cubic inches of water or roughly 2.5 gallons of water over the top of that drain pipe. (I could go further into the math, but for now let's leave it at that) vs. no overflow at all, take down the walls, leave the drain pipe still there.. Now you would have 24x24x7=4032 cubic inches of water or roughly 17.5 gallons of water over the top of the drain pipe. Will the larger volume of water (more weight) be easier to dial in than the smaller one?
I would assume that it would be...??
Now if that is the case, and you are only pumping 1000 gallons of water, would it not make sense to go to a smaller drain to increase your ease of "tuneability"??
I know I have more questions, just trying to figure it all out.. My system is up and running right now, I can fine tune it to an extent. I can get it to run silent, but I have low flow rate with a large drain. The tinyest turn of that valve causes the water to go one direction or the other.. It is difficult to get it perfect with that large of a valve.. I think with greater volume of overflow, will ease that adjustability issue. Or decrease the drain size should accomplish the same thing.. Yes no? Your thoughts..