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FIT On and Wash AWAY!
Do you face the problem like unstable of treated water quality or tiresome replacement of filter media? That is all caused filter media itself. We came up with an idea through our various know-how, experiences and achievements and finally produced exterior tank filter device, SWS (=Saito Washing System) which can promote your existing filter tank just put it on the outside.
SWS for any types of filter tank
Put SWS on any tanks
Just set SWS on the existing tanks, can be added strongly enough washing function on it. Of course, it applies to any downstream filter tanks.
Compact Design
Considering any situations, we succeeded to design for compact size including control device on it so that can fit any small spaces.
No need to change tanksf programs
Since SWS operates during the backwashing process, no need to set special system in the conventional operation process program.
Apply to multi layer like filter sand and Anthracite
SWS applies to clean up not only the filter sand but also Anthracite and can set both mono layer and multi layer tanks.
Succeeded in Germany and next Japan and the world

We produced SWS here in Japan and brought in Germany first to experiment its capacity with our exclusive distributor, Ecotron GmbH in Celle, Germany. They did demonstration test on actual filter tank.
Since this test succeeded, we have been promoting to sell it from April, 1st, 2009 in Japan and the entire world as well.

Also, we did the same test at the water purification plant in Japan to reconfirm SWS washing capacity. Effects of SWS, fixation sludge round the media were removed comparable to the new sand.

[Refer to the right pictures.]

Saito Washing System
Principle of washing filter media
A vortex flow generated by the gravity of particles and the lift force created by the screw. Particles running outward due to the centrifugal force generate a vortex flow. Vertical and horizontal 3D vortexes are generated and wash by kneading action.
High Cleaning Effect
Backwashing and air-washing can only prevent clogging. However, even stubborn sludge can be removed by kneading action among media particles. Therefore, filter media can be clean up to the under 30 degrees of washing turbidity comparable to the new sand.
Fillter media cannot be crushed using by Kneading action method.
Due to filter media washing each other by kneading action, filter media will not be crushed while only sludge attached tightly to the surface is removed. Therefore, filter media can be kept clean always.
The outflow of exfoliated sludge can be avoided or significantly reduced.
Through the high cleaning effect, the outflow of exfoliated sludge into treated water can be avoided or reduced, and can maintain stable water level constantly.
Preventing the filter media from outflow significantly.
Filter media run off during the backwashing process. That occurs regardless of particle sizes. SWS can significantly reduce the outflow by keeping filter media in the same condition as new filter media.
SWS Flow Chart

‡ABackwashing/ Saito washing system

‡BSWS washing ‡CBackwashing

Filtration process proceeds as conventional way. At that time, Valve is closed in order to avoid flowing untreated water into SWS device.

a) Backwashing process starts as conventional filter device.
b) At the same time, valve connected to SWS opens and slurry comes into SWS.
c) Saito washing starts by siphon motor rotation.

a) Saito washing finishes first.
b) Remaining slurry flows back into the tank.
c) Exfoliated sludge flows out the tank by backwashing.

After all the backwashing process finished, upper valve closes and returns to normal filtration process.

*Apply to multi layer, sand media and Anthracite.
In the filtration process, itfs proceeding water filtration same as conventional way.
Adding siphon washing system to conventional backwashing process can provide high quality and effective washing actions and keep media clean.