A. INSTALLATION GUIDE 4. INSTALLATION OF THE TANKS
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Installation and User guide – ECOROCK-5000 & BIOROCK Multirock Systems – 10-10-2017
Ensure that all levels are correct so that the wastewater can flow freely through the system
Check that all connections are correctly positioned
Ensure that the seals are watertight
4.2.3 Backfilling in dry ground conditions
Backfill the hole with 3 to 6 mm smooth pea gravel, or lean-mix concrete whilst filling the
tanks with water at the same level
Do not exceed 300 mm per filling and compaction cycle
Make sure that the BIOROCK® media is completely saturated with water
Do not backfill with the soil removed during the excavation: roots and stones can damage
the tank.
Do not compact the backfill material mechanically: compact manually.
Backfilling around and filling both the Primary Tank and BIOROCK unit(s) with water should
take place at the same time.
Once the backfilling is finished and compacted, check the levels of the tanks again
The lids or access covers of the system should be installed just above ground, level to
provide easy access for maintenance.
Close and secure all covers with screws
Complete the backfilling once all pipework has been checked and connected.
4.3 INSTALLATION IN HIGH GROUND WATER CONDITIONS
Appendix «Installation in high ground water conditions»
The ECOROCK-5000 units can be installed in high ground water conditions with special
precautions.
If you don’t use a BIOROCK Primary Tank, please confirm with the manufacturer that this Primary
tank is suitable for high ground water conditions.
If you don’t use a BIOROCK Primary Tank, please consult the manufacturer to
ensure this Primary Tank is suitable for high ground water conditions.
The level of the water table must never exceed the level of liquid inside the Primary
Tank. Extremely high water tables signify a flood risk which could cause water ingress
or collapsed tanks.
Multirock installations: The level of the water table must never exceed the level of
water inlet pipe of the Treatment Units. Extremely high water tables signify a flood
risk which could cause water ingress or collapsed tanks.
