Septic Tank Systems - the superior traditional two chamber design
Septic tanks and drainfield soakaways are now the polluting, outdated and more EXPENSIVE choice for off-mains sewage treatment. Septic tanks are often refused by the authorities.
A better choice is a sewage treatment plant which can discharge directly to a ditch, stream, etc. They are lower priced, smaller, cheaper to install than septic systems and do not pollute like the old septic tank and soakaway. As the Environment Agency now refuse septic tanks and insist on sewage treatment plants in many areas of the UK, it is essential to check first if one is acceptable before you buy. We have many customers who cannot use them after they have been purchased.
Septic Tanks - Benefits of the Crystal Low Profile Design
It is much cheaper to install a low profile septic tank than a spherical one.
Installation of a Crystal Class 1 Septic system - gravel backfill
Click below for Further Information
Septic Tank Design
Crystal Septic Tanks are our unique design with two chambers giving primary settlement of sewage and allowing secondary settlement before discharge of the effluent. They can also be fitted with a filter to prevent small solids from blocking the soakaway - the photo is of a failed soakaway in a lawn.
Small suspended solids are caught in the filter before they can damage the soakaway.
These filters are fitted as standard on septic tank systems all over the world - except for the UK. The filters slot into the vertical part of the 'T' pipe on the outlet pipe inside the septic tank.
The boggy area in the photo is caused by a septic tank soakaway that has failed.
It is also obvious from the photo that it was far too small - the average size should be between 80M² and 160M² and all of it must be 15M from any building.
Most houses today do not have enough garden area for a septic tank soakaway drainfield.
Crystal septic tanks are our own Yorkshire design and not available anywhere else.
Unique Septic Tank Aeration System
Crystal septic tanks are unique in that they keep the aeration process that was vital in the old traditional design.
They have a ground level vent pipe on the second chamber. This allows an airflow through the chambers and up through the soil vent pipe keeping the contents sweet and allowing an aerobic 'crust' to form on the top of the effluent. This forms a barrier between the effluent and the air and smothers the smell of the effluent itself. There is an airflow passage through the baffle between the 2 chambers. This allows smells to travel from the last chamber, through the first chamber and back up the pipework to the soil vent pipe on the house wall. Most septic tanks have a solid baffle and the smell is forced out through the lid of the last tank chamber as the gases have nowhere else to go. You cannot seal the tank lids as one of the gases given off is methane and you could turn it into a potential 'bomb'.
Features of the Crystal Septic Tank
- No metal struts to corrode inside.
- 25 year warranty.
- Smells are vented back to the soil vent pipe. through the drains and NOT through the lids.
- Two access points for emptying, one over each chamber, to make sure that all areas can be seen for sludge removal.
- Easy access to the 90 degree bends on the 'T' pipes inside the septic tank, should they block.
- Less pollution.
- The Crystal has a shallower in-ground depth.
- Septic tank filters (see picture on right) can be installed to reduce the suspended solids in the final effluent by up to 69%, protecting your soakaway.
- Available with different inlet and outlet options.
- Complete with moulded-in 1 metre neck extensions (cut to fit) and lids.
Sizes of the Crystal (Litres)
Unless you have very free-draining soil it is unwise to consider using a septic tank for populations over 13 persons as the size and cost of the soakaway will be prohibitive. A sewage treatment plant discharging directly to a ditch is a cheaper option.
Environment Agency Pollution Prevention Guidelines state that septic tanks are only suitable for small-scale developments up to 15 persons.
It is almost impossible to create a soakaway large and porous enough for the amount of liquid produced by larger populations. Even if you have enough suitable ground, the potential for groundwater pollution is too great and as most of the UK's drinking water is now obtained from boreholes, this is unacceptable.
All septic tank installations, even replacements, need Building Regulations and in some areas, Planning Permission. Always ask about the planning permission requirements of your particular Council before you buy, as some authorities have a blanket ban on septic tanks.
At the end of the current Environment Agency Review, a septic tank Exemption will be mandatory also. Before the beginning of the review, the majority of exemption applications were refused, so apply anyway, before you buy a septic tank, to make sure that it is acceptable. Currently, the application is free, but at the end of the review, there will probably be an application charge. Click here for septic tank exemption regulations.
You also must perform soakaway tests to prove that your land is suitable for a soakaway. 60% of land in the UK fails these tests and failure means that you are not allowed to install a septic tank at all.
Crystal Septic Tank - SPECIFICATIONS
CLASS 1 - Suitable for concrete base and granular (gravel) backfill
CLASS 2 - Suitable for full concrete surround only
Crystal's can be fitted with a Septic Tank Filter which prevents solids from blocking the soakaway.