Her are some pictures of how the drains are set up on my tank. The H2Overflows are both full siphon and the low profile strainer is the emergency drain. All are 1.5” drains.
Drain setup?
- Thread starter jandb
- Start date
Her are some pictures of how the drains are set up on my tank. The H2Overflows are both full siphon and the low profile strainer is the emergency drain. All are 1.5” drains.
If the pipes height are as shown in the first picture, the taller 3/4" pipe may not reach full siphon being a few inches under the water level.
OP, I would add strainers to your siphon standpipes. It's worth it IMO.
Good point I forgot there were pics on the 1st page. I thought at least 6 inches was required. Something about providing enough pressure on the stand pipes.
I would assume 2x 3/4 at full siphon would be well over the 400ish op is getting
I cut down the second 3/4” drain to make both full siphons. It’ll flow real well but I think I’m being limited by the overflow teeth. It’s a side overflow box. When I cranked the pump up and tried to tube it the main tank level was high. Does that make sense?
Yes it does. It's not uncommon for the wier to be a limiting factor. Can you take a video of it. Upload to youtoube then post the link here ?
How low are the standpipe from the surface ?
Seems like your gph is on the up and up lol
It's tough to say sometimes the stand pipe height requires tweaking.
Hey, I'm a little late to the party...as usual! I wanted to bring up one of your issues with redrilling the 3/4" bulkhead holes to go with larger stand pipes for your full siphon. It's really easy to do and I've done it many times on glass. Just cut a square piece of wood and drill a guide hole for your hole saw to fit in. Either hold it or clamp it (if possible). Works really well for boring holes when you cant utilize a pilot bit. If you're having a hard time visualizing what I'm talking about, let me know and I'll post a photo.
