[Przemek Jersz]

Hi I just got s new tank (500l) when I open the lid it looks like a gas is coming out , like when you opening a fizzy drink
Any idea why that is?
Thanks

[Elfyn]

Doesn't your tank have a vent on it (usually on the lid)?

[Przemek Jersz]

No it's sealed , should I drill through it to make a vent

[alanwilson]

Tank needs a vent to allow air in, to replace the water taken out

[Tosh]

Drill a small diameter hole, no more than 5 mm at the base of the tank. This will let just the right amount of air in as the tank empties of water, which prevents a vacuum forming.

Usually 2” from the bottom is about right.

Good luck 

[Przemek Jersz]

Thanks guys

[alanwilson]

Drill a small diameter hole, no more than 5 mm at the base of the tank. This will let just the right amount of air in as the tank empties of water, which prevents a vacuum forming.

Usually 2” from the bottom is about right.

Good luck 

At the base of the tank??  Do you mean the lid?

[AuRavelling79]

Drill a small diameter hole, no more than 5 mm at the base of the tank. This will let just the right amount of air in as the tank empties of water, which prevents a vacuum forming.

Usually 2” from the bottom is about right.

Good luck 

At the base of the tank??  Do you mean the lid?

It's just young Matthew being a wag! Laff! 

[Tosh]