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9″ X 4″ BOTTOM DRAIN AND DOME

This bottom drain has been designed to work in conjunction with 110mm solvent weld pipe. Please see our Pipe Identification chart for more information.

Our 9″ X 4″ bottom drain and dome are designed to provide a high efficiency/low maintenance system when constructing a pond, as it draws debris and solids from the lowest level.

Using a gravity feed system is more beneficial as the solids get fed straight into your filter system for removal and not liquidised into fine particles, as with a in pond pump. The finer the particles the harder it is for your filter system to remove them, resulting in a poorer quality of water.

The 110mm outlet on the 9″ x 4″ bottom drain gives a high flow of water. This gives a good 'draw', removing debris from across the bottom of the pond.

Where to Locate my Bottom Drain?

Bottom drains are located on the pond floor and should be positioned in the deeper areas of the pond. Bottom drains consist of a sump, which is set into the pond’s base and is attached to the pipework.

A pond can be built with multiple bottom drains along the floor, leaving no area in the pond for sludge to accumulate.

Planning and Construction

As the pipework used in the construction of a gravity fed filter runs under the pond and is usually set in concrete, bottom drains should be considered at the outset of pond planning and installed as the pond is built.

Bottom drain setups are much more efficient than having a pump feeding a filter situated in the pond. Bottom drains can handle larger solids than most types of pond pumps and are far less likely to block or become hampered by debris.
The sump is supplied with a flange ring that can be screwed to its top lip. If the pond is liner based, the liner should be sandwiched between the flange ring and the sump lip and adhered with a non toxic sealant, creating a watertight seal. If the pond is constructed from concrete the flange ring is not required. The top of the sump should be set level with the pond’s final rendered layer. A gap of usually around 2cm to 5cm is set between the top of the sump and the dome and should stop smaller pond fish from entering the filter system.
To obtain a maximum flow rate and reduce the build up of debris in the pipework, when connecting the bottom drain to the filter, the pipes should run as directly as possible and any bends should have a large curved radius.

My Existing Pond Doesn’t have a Bottom Drain Installed

If you have an existing pond that doesn’t have a bottom drain installed and you don’t want to undertake the huge task of completely rebuilding your pond from the ground up, don’t worry, eco-filtration has the answer.

eco-filtration stock the largest range of weighted suction domes available for the koi market. A weighted suction some is a portable bottom drain and offers the same great advantages as a bottom drain sump but without having to rebuild your pond.

For more information on our weighted suction dome range please see our Product Archive.

Bottom Drain Solvent Weld Sump

The sump is manufactured with a joining socket that has a 110mm internal diameter (ID). This will receive waste pipe with an outside diameter (OD) of 110mm (please refer to the pipe dimension and identification chart).

Pressure or Waste Solvent Weld
If the application of 4” pressure pipe (114.3mm) is needed, eco-filtration stock a large range of reducing/joining bushes. We sell a 110mm – 114.3mm reducing socket purposely designed for the job. This will convert your standard 4” waste (110mm) bottom drain sump socket to receive 4” pressure pipe (114.3mm). Please see our Product Archive for further details.
This item comes supplied with:
9″ x 4″ Bottom Drain Sump
Rubber Membrane Aerated Dome
Ring
High Adjuster Tube
12 x Stainless Steel Screws
Instruction Leaflet

Have You Seen our Replacement Domes?

Also available to purchase separately are the aerated bottom drain domes, allowing you to upgrade your bottom drain dome to an aerated version at a later date.

There are 3 different models in the aerated bottom drain range:
Single ring Aerator Dome
Aqua-Jet Air Diffuser Aerated Dome
Rubber membrane Aerated Dome
Why an Aerated Bottom Drain?
The benefit of having an aerator on your bottom drain is the rising air bubbles makes an uplift. This circulates the water towards the bottom drain making it up to 30% more efficient at removing debris and waste from the pond. Not only does it help with the performance of the bottom drain but also aerates the water making for a healthier environment in your pond.
For more information please see our Product Archive.