Reliable filtration & protection

The Grünbeck BOXER KX fine filter

The BOXER RX backwash filters are designed for the filtration of drinking water. The filters can be used for positive pressure and negative pressure applications. The adjustment of the holding pressure on the withdrawal side only works when applied in the positive pressure range. The BOXER KX backwash filters are designed according to the specifications of DIN EN 13443-1 and DIN 19628 and are intended for installation into the drinking water system according to DIN EN 806-2 (installation immediately downstream of the water meter system).

BOXER RX backwash filter to protect the domestic water system

They protect the water pipes and connected water-carrying system parts from disturbances and corrosion damage due to undissolved impurities (particles), such as rust particles, sand, etc. The unfiltered drinking water flows through the inlet side into the filter and then passes from the outside towards the inside through the filter element to the pure water outlet. Thus, foreign particles with a size > 100 µm are retained. Depending on their size and weight, foreign particles stick to the filter element or they fall straight down into the filter cylinder.

The drain is opened by turning the backwash handwheel as far as it will go, and backwashing is carried out. The water flows through the primary screen to the filter element and then passes through the filter element in the opposite direction to normal filtration. Particles sticking to the filter element are detached and washed out to the drain. We recommend performing a backwash every two months.


  • Connection flange incl. water meter screw connections (made of dezincification-resistant brass) with seals and stainless steel screws
  • Filter element made of stainless steel mesh
  • Maintenance ring for setting the next maintenance date (backwash).
  • Ergonomic handwheel for easier release of backwash
  • Transparent blue filter cylinder that can be tightened by hand
  • Drain connection DN 50 according to DIN EN 1717 for connection to the drain pipe with integrated outlet.
  • All water contacting parts comply with the German Drinking Water Ordinance. Test regulations: KTW, DVGW W 270, DIN 50930-6.
  • Recyclable materials

Technical specifications

3/4" 1" 1 1/4"
Flow capacity BOXER RX, Δp = 0.2 bar [m³/h] 2.9 3.8 4.2
Flow capacity BOXER RX, Δp = 0.5 bar [m³/h] 4.7 5.9 6.7
Installation length without screw connections [mm] 100 100 100
Installation length with screw connections [mm] 185 182 191
Overall height incl. outlet funnel DN 40 BOXER RX [mm] 315 315 315
Order no. BOXER RX 101510 101515 101520