Wrong priorities :razz: You already smell funny from ruttin' about in a fish tank, might as well quite the baths too.

Maybe i don't get the joke of what you are saying but I don't think it is funny or is appropriate answer to my question of this thread. Please take your joke some where else if you don't have any better thing to say

Hey sorry, I was just joking that a reefer doesn't need a bath tub, only a tank. Wasn't meaning any offense.

As I said in my first post, you can do what you're planning to do as long as there are no abrupt up and down in the piping that would cause air pockets (that break the siphon) or stagnant water.

oh no problem :-) i had bad day yesterday and probably misunderstood your joke.

Tai you think about crap too much just do it lol

yeah yeah yea, speak the man who gonna help me. You come and do it :-)lol

I'm just trying to look at your build thread and understand this. So the sump will sit in a different room, but on the same floor? Ie. not underneath in the basement or something. I assume not underneath like that because then you could just go straight down first and pipe under the bathtub.

So is the sump then 2 rooms away if it is on the same floor but has to bypass over a bathtub? What size plumbing are you using on the drain line?

I would think that for a Herbie, it wouldn't matter if the main drain line had an initial upwards slope because that will just add more backpressure to the line and then you just have the gate valve opened more. But if the emergency drain line has upward slope then as stated already you want to ensure a constant trickle flow to prevent stagnant standing water but I worry that even a trickle would be subject to occasional burping which is going to totally defeat the purpose of having gone Herbie in the first place.

Can you post some pictures or diagrams?

No problem. Yesterday was about the same for me :razz:

I don't know if you mentioned this but why aren't you having the sump under the tank?

One other solution that you could think about is to have a small sump under the tank the handles the overflow and emergency drain and recycles it back to the tank, then have a small return pump send water to the main sump for treatment. Flow matching because a bit more challenging here but it eliminates the problem of having an emergency line that flows uphill.

My original plan was to have the sump under the tank but then, for the easy of cleaning, but then i got to talk into put it in the mechanical room for easy cleaning and noise problem. Your idea maybe not a bad idea, hmm, what is the best way to do flow matching. Time for google :-) Cheers

If you're going to pump water from a sump below your tank to another sump in the mech room the 2nd sump will have to be higher than the first sump and have an overflow installed so water can flow back to the sump under the tank. I really have no clue what ScubaSteve is suggesting but attempting to match flow from two or more pumps is bad idea, not saying that's what he is in fact suggesting. Whatever you pump water to has to have dependent flow rate back, not independent.