The GRAF Retention cistern combines rain retention with rainwater harvesting.

The GRAF retention cistern is a combination of rainwater retention and rainwater harvesting. The detention can be larger if required. In this case, part of the rainwater can also be used in addition to the required detention volume. For example, rainwater can be used for the following applications:

• Watering gardens

• Flushing toilets

• Washing machines

• Cleaning

The use of rainwater means that up to 50 % of drinking water can be saved, and up to 85 % for commercial properties.

The retention cistern is designed such that the rainwater first fills the useage volume. When the useful volume is full, the throttled outflow is activated and the detention volume also becomes available for temporary storage. The detention mechanism with throttled outflow in turn corresponds to a conventional retention system. Following the rainfall event, the position of the outflow prevents the detention cistern from being completely emptied, while the useage volume remains in the tank!

 

Advantages Carat XXL retention cistern:

  • Suitable for HGV loading up to 40 t
  • Can be mounted in groundwater
  • Dome opening with stainless steel profile for precision fit and secure mounting
  • Lower weight than concrete and steel
  • Various connection surfaces DN 100 (4")/150 (6")/200 (8")
  • Available with DN 300 (12") connection as an option
  • Available with a second tank dome as an option
  • 102,000 l Volume possible
  • Investment security thanks to a 15 year warranty

Advantages

Thought-out in every detail

Low weight
Low weight
Low weight

Tank installation made easy! The significantly lower weight of GRAF products compared to steel or concrete cisterns makes transport and installation easier.

Optionally with second tank dome
Optionally with second tank dome
Optionally with second tank dome

The GRAF XXL tank can optionally be equipped with a second tank dome.

Retention Plus
Retention Plus
Retention Plus

A combined retention/rainwater utilisation saves up to 50 % drinking water. The water can be used for garden irrigation, cleaning work and in the house also for flushing toilets and washing machines.

Ready for connection
Ready for connection
Ready for connection

With GARANTIA tank systems, the connection seals are already pre-drilled and lip seals are pre-assembled. This saves time and therefore costs during installation.

Dome opening with stainless steel profile
Dome opening with stainless steel profile
Dome opening with stainless steel profile

Dome opening with stainless steel profile for high fitting accuracy and mounting safety.

Individual connections possible
Individual connections possible
Individual connections possible

Flexible connections possible according to customer requirements on the tank dome up to DN 300 or on the end face up to DN 300.

Low weight

Tank installation made easy! The significantly lower weight of GRAF products compared to steel or concrete cisterns makes transport and installation easier.

Optionally with second tank dome

The GRAF XXL tank can optionally be equipped with a second tank dome.

Retention Plus

A combined retention/rainwater utilisation saves up to 50 % drinking water. The water can be used for garden irrigation, cleaning work and in the house also for flushing toilets and washing machines.

Ready for connection

With GARANTIA tank systems, the connection seals are already pre-drilled and lip seals are pre-assembled. This saves time and therefore costs during installation.

Dome opening with stainless steel profile

Dome opening with stainless steel profile for high fitting accuracy and mounting safety.

Individual connections possible

Flexible connections possible according to customer requirements on the tank dome up to DN 300 or on the end face up to DN 300.

Sizing

Volume [l]Length [mm]Width [mm]Height [mm]Weight [kg]order no.add to enquiry
16000459025003160750380520
220006230250031601000380521
260007200250031601100380522
320008440250031601380380523
360009410250031601480380524
4200010680250031601770380525
4600011650250031601870380526
5200012920250031602160380527
5600013890250031602260380528
6200015160250031602550380529
6600016130250031602650380530
7200017400250025502940380531
7600018370250031603040380532
8200019640250031603330380533
8600020610250031603440380534
9200021880250031603730380535
9600022850250031603830380536
10200024120250031604120380537
10600025090250031604220380538
11200026360250031604510380539
11600027330250031604610380540
12200028600250031604900380541

calculated size Request for information

Technical details

Accessibility

Earth covering with loading capacity [mm] 800 - 1500
max. axle load [t] 13.5
max. vehicle weight [t] 40
max. vehicle weight with reinforced concrete slab [t] 60

Groundwater installation

Earth covering with groundwater installation [mm] 800 - 1500

Installation

max. earth covering [mm] (without groundwater, vehicle loading) 1500

Accessory