Filtration is an additional step in the overall treatment plant that improves the quality of treated effluent. Improved effluent quality may be a regulatory stipulation or required for wastewater reuse.

Aerofloat incorporates filtration steps into the overall treatment plant design where required, and works collaboratively with respected product suppliers when sourcing the equipment.

Aerofloat designed and installed several filtration treatment steps at Visy’s new corrugated box processing and printing plant in New Zealand: including ultrafiltration, sand filtration and reverse osmosis. As the site was not connected to the sewer, the regulatory authorities stipulated a very stringent water discharge standard. As such, the heavily contaminated process wastewater was treated to a standard suitable for irrigation. It was also reused as boiler feed water and repurposed for use in the starch makeup solution – forming a complete water recycle loop.

Contact Aerofloat today to discuss your filtration equipment questions.

Download Aerofloat’s Water & Wastewater Products and Processes Brochure

Sand Filtration

Sand filtration is a process used to typically reduce suspended solids in wastewater from 20mg/L to 5mg/L.  Depending on the level of treatment required, a sand filter is a great final stage or as a pre-treatment step to MF, UF or RO.

Contact Aerofloat’s expert engineers today to discuss if sand filtration is a right fit for you.


Microfiltration (MF) is a similar process to ultrafiltration but removes solids down to 0.1-10 microns. Again, depending on the quality of influent and the desired effluent standard, the MF may be installed as a stand-alone final treatment step or as pre-treatment to RO.

Contact Aerofloat today to discuss the filtration options available.


Ultrafiltration (UF) is used to remove solids down to 0.005 microns. The process can remove low concentration colloidal solids in sewage or industrial effluent.  Depending on the effluent quality required, a UF may be installed as a pre-treatment step to RO.

Contact Aerofloat today to see if ultrafiltration can assist with improving effluent quality.

Reverse Osmosis

Reverse osmosis (RO) is a process used to filter out dissolved salts from high saline waters. The treated effluent from RO can be used for drinking water or industrial process water reuse. RO is typically the final stage of treatment and can remove some organisms (such as viruses), as well as the dissolved salts.

Contact Aerofloat today to discuss which filtration system best suits your needs.