A List Of Things You Shouldn't Flush Into A Septic Tank

What Can and Cannot Enter My Septic Tank

This is a very commonly asked question of our engineering and sales staff. Some companies will provide misleading information at point of sale in order to get you to purchase their system. We prefer to be honest.

There are certain items and products that cannot enter a sewage treatment plant. Below is a list of some of the main items.

1 – Baby wipes

These often end up in a sewage treatment plant. They are not a big issue for a gravity discharge plant. But in a system with a pumped discharge, baby wipes can get caught in a pump impeller. So baby wipes should not be flushed. Bin them!

2 – Bleach

We all use bleach in our bathrooms. Our sewage treatment plants can deal with bleach, as the volumes used are small and it becomes very diluted. BUT – if you are operating a B&B, hotel or guest house with large volumes of bleach used daily, we can design a system that can buffer and dilute the bleach. If this is not done the bleach can kill the bacteria that clean the wastewater and the cleaning process can fail.

3 – Dishwasher/washing machine/sink waste

Our systems can deal with this type of waste. Many other systems cannot, and suppliers will tell you to direct this waste to a separate tank or soakpit. Our systems deal with this waste easily, as they were designed to do so. No need for extra tanks and soakaways. BUT – if you have a hotel or B&B and the washing machines are going all day, we can design a system with additional settlement/buffer tanks to deal with the detergents.

4 – Sanitary items

These should not enter a plant. The reason for this is they can cause blockages and get caught in pumps. Bin them please!

5 – Roofwater

This cannot enter a system. Typical domestic sewage treatment plants can only deal with approximately 1200L of sewage each day. While our systems can deal with +50% overload for short periods [e.g. people staying over at a weekend, parties, etc], roof water poses a problem. To explain why – 3 hours of torrential rain onto a big roof can produce many 1000’s of liters of water. If this enters the treatment tank, the system gets overloaded, and all of the partially treated wastewater is flushed out of the system before it is treated properly. Roofwater should go to a separate soakaway always.

This is not a comprehensive list. If you have questions on what can or cannot enter a sewage treatment plant, please call to speak to us. We would be happy to answer your questions.


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