Experts in water remineralization

Limestone contactors in containers

The DrinTec™ design of upflow limestone contactors of constant height simplifies the reload operation by means of feeding the granulated limestone continuously, under water and directly on to the limestone bed by using a limestone feeding system, thus maintaining a constant bed height all the time. It‘s a very effective system that will operate continuously for many years without needing to perform a backwash.

This procedure has the advantage that the quality of the outlet water is always constant. In addition, operational and maintenance costs improve considerably over the traditional designs. Each unit is individually made according to project specific needs.

The limestone contactors are usually placed in parallel. Because they have the same height they offer the same counter-pressure. This facilitates the hydraulic design of the inlet manifold and provides an uniform and constant water distribution to the different tanks.

The contactors work directly with the water pressure from the reverse osmosis output.

The turbidity of the limestone contactors is controlled using dust free material and maintaining a constant flow rate, i.e. avoiding sudden changes in flowrate. During water shocks flow is initially diverted and incorporated gradually thereafter to the contactor.

There is very little need to purge the limestone contactors, as they operate upflow and do not tend to clog. However, at least once a year a 5 minutes sponging is recommended to reduce the risk the formation of preferential pathways.

This design concept looks to reduce the height to minimize visual impact and to take advantage of the steel structure of containers to hold inside limestone contactors.

The recharge is done from the top part, by removing the canvas from the container.

The installation is quick and easy.

Internal parts and the DrinTec™ process are protected by various patents.

Advantages of DrinTec™ limestone contactors process:

  • Equipment shipped in standard ocean container
  • Very high efficiency
  • Low or no automation
  • Constant performance and water quality
  • Low maintenance cost
  • Minimum or no energy consumption
  • No moving parts
  • More than 30 days autonomy
  • No need for qualified workforce to operate
  • No need for frequent backwash
Previous Image
Next Image

info heading

info content


Drintec Limestone contactors in containers
2.0 MiB

Technical Specs:


20′ container 40′ container Units
Maximum treatable flow Up to 1100** Up to 2800** m³/d
Turbidity < 1 NTU*
Container weight (empty tank) ≈3000 ≈7500 kg
Container weight (full tank) ≈35000 ≈75000 kg
Maximum operating pressure 1 bar
Outlet pressure Atmospheric
System autonomy 30 days
“Worm Tank” dimensions 4790 x 1625 x 2000 4790 x 1625 x 2000
4790 x 1625 x 2250
(l x w x h) mm
Height depending on flow requirements
Container type 20’ Standard 40’ High Cube
Container internal dimensions 5900 x 2350 x 2393 12036 x 2350 x 2693 (l x w x h) mm
Design temperature 40 ºC
Required material for operation Granulated calcite & CO2
Energy consumption Nil KWh/m³
Installation “Plug and play”
Time between backwashing At start up and then once a year
Backwash water 220 220 m3/h at 1 bar
Backwash air 500 500 Nm3/h at 0,7 bar

* Assuming good quality calcite as per our recommendations in our technical brochure.
** Depends on permeate characteristics and water temperature.

Contact us for more information

Desarrolado por

Copyright © 2021 LCCH. All Rights Reserved.