Septic tanks

How do our septic tanks work?

Primary treatment

Domestic wastewater flows through a sewer pipe into the septic tank.

The septic tank allows wastewater to separate into three layers: scum, sludge, and liquids. It also significantly reduces the pollution load by way of bacterial anaerobic digestion.

Scum is made up of oils and greases that rise to the top of the septic tank. Sludge is made up of solids that settle on the bottom of the tank. Both scum and sludge should be removed every two or three years by a septic pumping expert.

Partially clarified liquids accumulate between the scum and sludge layers and exit the septic tank through an outlet pipe. This pipe is fitted with a built-in effluent pre-filter that captures suspended solids and prevents them from clogging downstream components.

The following pre-filters are used in our septic tanks:

• PF17: tank capacities up to 8,000 L
• pre-filter with a built-in safety and cleaning system

• PF525: tank capacities of 10,000 L or more
• pre-filter with safety system only

Discharge options

Wastewater discharge is subject to the regulations in force in your area.

In most cases, wastewater seeps directly into the ground or enters one of the following secondary systems for further treatment:

• Ecoflo biofilter
• moving bed biofilm reactor (MBBR)
• sequencing batch reactor (SBR)
   

For septic holding tanks, which have no outlet, raw wastewater remains in the tank and must be periodically pumped by a qualified service professional.
 

Treatment performance

The performance of the Rewatec Millenium septic tank, fitted with a pre-filter and designed for standard residential wastewater:

• COD reduction: 45 - 55%
• BOD₅ reduction: 35 - 40%
• TSS reduction: 75 - 80%

Septic tank maintenance

Premier Tech recommends that you follow maintenance instructions according to the model installed. Protect your investment, maximise its service life, and maintain your warranty by having your system regularly inspected.

The frequency of service depends on the size of your tank, the amount of wastewater your property generates, and the environmental regulations in your area. It is best to speak with a local professional to determine the service schedule that is right for you.

When your service provider visits your property, they should:

• check for cracks or leaks in the tank
• measure the scum and sludge layers
• pump the septic tank, if necessary
• clean the effluent filter in the outlet pipe
• keep and update maintenance records for your system
• explain any areas of concern
• recommend next steps, if necessary

Rewatec septic tank warranty

For more than 25 years, we have developed sustainable, long-lasting products that make a difference for our clients, our professional partners, and our planet.

The Rewatec septic tank comes with a 5-year warranty, provided that all instructions are followed for system installation and use.