Backyard Aquaponics
A place to discuss aquaponics

Hi guys.

Just another quick question. I have read in another post that the water inlet from your water pump into the fish tank should not be under the water level.

Is this right!

And why? Is it only to do with airating the water?

Thanks
Matthew

Im not sure I understand the question sorry

Ok the pipe from my pump in the sump tank to the fish tank. Is there a reason for the water flowing into the fish tank to be above the water level or can it be below?

Can you post a diagram as I'm still confused by the question

Ok I think Ive got you. You could put it under the water line in the fish tank if you like, I would assume most don't because they are after water surface disturbance and aeration. But if the water splashing isn't your cup of tea you could add a venture to that pump line and submerse it to provide addition aeration and water movement.

I think the OP meant the outlet pipe shouldn't be under water. If it is, and the power goes out, water will back-syphon out of the fish tank.

If you are set on introducing the water below water level, then you will need an open top loop at or above the water level to prevent drain back or siphon. The only benefit I see to that, however, is reduced noise. Certainly there would be less aeration.

Many commercial RAS systems have the inlets underwater because they are trying to create a current in the tank.

Thanks guys.

I tested it an it does siphon back to my sump tank.

That is a very good reason.

Regards
Matthew

Yes good point made by the guys. You would need to put provisions in place to prevent syphoning.

Is it just the splashing noise you are worried about? You can get tricky with your piping to the FT so syphoning doesn't occur.

This is a standard RAS inlet. FT cant siphon because when FT water level drops fist jet allows water in.

Umm I mean air

This is how I have my return pipe from the sump tank, through the top of the tank (venturi through the bend to add oxygen) and down to around the middle of the water level.

Yup, up and over. Again, if you want the plumbing to enter lower on the tank, you can just bring the plumbing up above water level, and use a tee instead of an elbow on top to prevent a siphon.