Hey Tim, you should always use teflon tape with threaded connections (except unions which have a rubber gasket), and purple primer with slip connections. Wherever you need parts to be removable, use a union rather than threaded PVC parts. Also, when tightening plastic threads, do not overtighten! A quarter to half turn beyond hand tight is fine.
I can't see your tank so don't know exactly what you are talking about on all fronts, but splashes from the drain into the sump may be easily cured by just putting the drain line exit under water.
Sounds like it's herbie time, though! Put the primary drain under the water level, and the safety drain over the water level (I mean in the sump), so you'll have an audible warning that your main drain needs adjusting. I'd also highly recommend a gate valve for the drain adjustment valve. I used a ball valve on my 90g, and it was pretty imprecise. I'd imagine on a small tank that small level of adjustment would be critical. You'll need to order the gate valve online, though, most likely.
Let me know if you have any questions about how to plumb the herbie drains!
I can't see your tank so don't know exactly what you are talking about on all fronts, but splashes from the drain into the sump may be easily cured by just putting the drain line exit under water.
Sounds like it's herbie time, though! Put the primary drain under the water level, and the safety drain over the water level (I mean in the sump), so you'll have an audible warning that your main drain needs adjusting. I'd also highly recommend a gate valve for the drain adjustment valve. I used a ball valve on my 90g, and it was pretty imprecise. I'd imagine on a small tank that small level of adjustment would be critical. You'll need to order the gate valve online, though, most likely.
Let me know if you have any questions about how to plumb the herbie drains!
This is all very helpful, B -- thank you! The "what to use and when and why" is what I'm trying to figure out -- never knew the advantage of the union joint (still don't know if I really need it -- I guess I don't really plan on removing the valve other than for cleaning, but the rubber gasket sounds convenient!).
Also good to know that I don't need to channel-lock the threaded stuff in place. that will make life a lot easier when i have to undo the valve later today so I can teflon tape the threads (though it's going to be a pain to loosen that thing).
as far as my current problem, i really think it's built-up backpressure in the durso that's causing the gurgling i'm getting.
Still weighing the pros/cons of the herbie. so, let's say hypothetically that the main drain clogs, shifting over to the emergency drain. everything drains out of the emergency drain into the sump/i hear splashing/i know to check something because something's gone wrong. but, what if i'm not there to check it? how long does the emergency drain work? until it clogs?
I will say, a definite advantage of the herbie over other setups is that I don't have to use so many short lengths of tubes (almost ends up creating a rigid tube between the return bulkhead on the tank and the eheim). very hard to work with.
correct me if i'm wrong, but the idea behind the herbie is just that you create a siphon that drains under water, you adjust the siphon with a valve to make sure you have the right amount of water flowing through it so that you aren't drawing air, and that silences everything? and, the emergency standpipe is just to take over in case the main drain gets clogged?
if this is all correct, i wonder if there's any alternative available to the emergency drain. For instance, what about a split drain/emergency drain connected together with a T and using a gate valve submerged in the overflow (or would this screw up the siphon?). Or, what about a clever use of float switches (there'd need to be something that, when turned off, can ensure that it stays off, so that when the water level in the overflow falls to normal operating levels, it won't kick on the return pump and start the cycle over again)?


















