Important information for all our business partners

Handling of BWT water+more filters after operational breaks

steam and coffeemachine steam and coffeemachine

Revised recommendation on BWT filter handling

Filter­ flushing


As a matter of best practice, we recommend filter exchange after 4 weeks of operational break, for safety reasons. This does not take into consideration local water conditions and local safety measures. Unless previous examples of extended shutdown have created specific problems on site, such as blockages due to high content of particles, bad smell or odour from local tap water, then 'dormant' filters can be taken in operation again after 4 weeks or longer by flushing with volume of water as given in table below (B).

We recommend to first flush the connected device (e.g. coffee machine) and also the supply pipework for minimum 10 minutes, separately from installed filter, and before flushing the filter with extended volume (B). Exchange of filter is mandatory after specific filter capacity is reached, or minimally 12 months after first installation. Standard cleaning procedures for water-dependant functions of the connected device (e.g. coffee machine) as defined by the manufacturer should be strictly adhered to.

bestmax all
bestmax all
bestmax premium
bestmax premium
BWT bestprotect

Flush or change? 

filter flushing
after first instal­la­tion - filter exchange

The process

How to flush a filter? The next eight steps discribes the flushing with filterheads BWT Flex and BWT Standard.

Step 1

Take a clean bucket

Step 2

Find where the water filter is located. It is usually close to the equipment (coffee machine, vending machine, oven ….).
Have a look at the catrigde

Step 3

Have a look at the EASY-Vent flushing valve on the besthead FLEX filterhead or the bestflush on a standard besthead. If no bestflush is installed, then use the outlet hose from the filter.
Topview of filter heads

Step 4

Place the open end of the flushing pipe or the outlet hose inside the bucket.
water flushing for Filterheads

Step 5

Make sure water inlet valve is completely open.
water pipe

Step 6 a)

Open the EASY-Vent valve so that the water starts filling the bucket.
open easy-vent

Step 6b)

Press the bestflush and keep it held so that water starts filling the bucket.
Pressing Vent

Step 7

Flush the filter with these volumes. Valid for all our product ranges. Except BWT bestcare

Filtersize  Count of buckets
 X  2 buckets (10 L)
 S  3 buckets (20 L)  
 V  4 buckets (30 L)
 M  7 buckets (50 L)
 L 10 buckets (70 L)

12 buckets(90 L)

 XXL 20 buckets (150 L)


Step 8

BWT besthead Flex - close the EASY-Vent valve to stop water flow.

BWT best­head Stan­dard -  Release bestflush and close water inlet valve (in case there is no BWT bestflush on the installation).

Close the vent ventils

Revised recommendation on BWT filter handling

Recommended flushing volumes of BWT water filters by size, type of filter and operational break/time
  BWT Filter Catridge Sizes    

X S V  M L XL 2XL BWT water+more prod­ucts
in litres                
Minimum flushing
volume (A)
 1 2 3 5 7 9 15 see: Products (1)
Minimum flushing
volume extended (B)
 10 20 30 50 70 90 150 see: Products (1)

(*) recommend in parallel flushing of contected device (eg coffee machine) and pipework of location for min 10 minutes separately from installed filter, before flushing the filter with extended volume (B).

(1) Products: BWT bestmax, BWT bestmax PREMIUM, BWT bestmax SOFT/SMART, BWT bestprotect, BWT besttaste, bestdrink PREMIUM
Products mandatory to exchange after 4 weeks or longer after operational break: all other filters, e.g. BWT bestcare, BWT bestcare MINI

More information

In addition, we want to assure you, that BWT has already taken all measures necessary to support you and your partners fully in these challenging times. We have taken care for the protection of our employees, our partners, and for the secure production and delivery of our products to all our partners worldwide.

All our activities are fully in line with the recommendations and safety measures provided by the international authorities as WHO and local Governments. Taking these safety measures fully into consideration, our local BWT teams are always available for your support and assistance.

Your contact