Free Standing Rubber Membrane Air Diffuser

Diffuser made of a microperforated EPDM membrane that has already been weighted and is ready to use.


This membrane produces a column of tiny bubbles that collapse when the air pump is turned off, blocking the entry of contaminating substances.


The pores cannot readily be deposited bacterial biofilm as they open in response to the pump's impulses, preventing the typical clogging of standard diffusers.


This aerator's convection movement does a great job of oxygenating the pool.
Thus, a convection action raises the lower water layers to the surface, and the air/water interface increases the oxygen content of the water.


Since the air bubbles released by this diffuser do not have enough time to release much oxygen, the objective is not to primarily oxygenate the pool with them.
but to use the convection action to oxygenate the pool.


The minimum recommended flow rate is 20 l/min per pool depth; clearly, the flow rate must be adjusted during the summer.


Two sizes are available: 130 mm or 180 mm.

Is delivery free?

We offer free delivery on the majority of our products over £50. This excludes live fish and bespoke filters. Delivery to UK mainland addresses is £3.95 as standard, or £6.95 for express.

How do I return a product?
Get in touch via email or phone and let us know your problem, we will then help as much as possible. A postage address will be given for you to return the product back to us, and postage will be refunded where applicable to our terms and conditions, which are in line with consumer rights.

At Steel City Koi, we offer a wide range of safe and secure payment options when shopping with us.

Accepted payment methods:

Debit/Credit Cards (Inc American Express)

BACS (for faster dispatch of products) please get in touch for this

Cash upon collection *only for live fish

Pay Later options currently include Klarna and Clearpay