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The waters which are from heaven and which flow after being dug, and even those that spring by themselves, the bright pure waters which lead to the sea, may those divine waters protect me here'
- (Rig-Veda, Book  VII, Hymn 49.2

ZEN under drain offers exceptional filtration performance in the water and waste water treatment industry whilst having low maintenance and operational cost. As compared to other underdrains, ZEN has a range of advantages that make it a prime choice between the two for major water utilities. ZEN under drain has a higher capacity system that lasts longer and reduces installation as well as operating costs. Reduced consumption of treated water for backwashing, savings in filter height and volume, faster and easier installation, simplified design filter and no need of suspended plenum floor and gravel make it supreme choice for water utilities.

BENEFITS OF ZEN UNDERDRAIN

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Improved Backwash Effectiveness:

The uniform bubble pattern of the ZEN Underdrain system allows an air/water backwash as vigorously as required without media upsets. Improved backwashing results in longer filter runs, less backwash water used and a cleaner, better performing filter bed.

Increased Filter Capacity:

The collection area of the screens’ surface is up to 108% of the total filter floor area. This means flow through is unimpeded and because ZEN Underdrains have a higher open area, pressure drop is reduced. This allows the end user to have greater flexibility to meet operational demands. The ZEN Underdrain’s unique design provides a higher water velocity than conventional nozzles and provides a higher filter loading rate. Low profile screens and the elimination of gravel media layers make more room for additional filter media, which results in a treatment that is more effective.

Filter Bed Upsets Eliminated:

Conventional backwashing systems can disrupt the support gravel and lead to problems ranging from minor loss of flow efficiency to a complete system shutdown. As the treatment media rests directly on the face of the screens, gravel potential for bed upset can be eliminated as well as the.

PROBLEMS SOLVED

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ZEN Underdrains are designed to solve typical problems that occur in filtration plants and offer the following advantages:

  • Smooth robust plug-free retention surface

  • Covers the entire filter area

  • Direct retention of filter media

  • Slot opening to suit various filter media sizes

  • Effective washing (air/water)

  • Low headloss

  • Lower through slot velocity compared to nozzles reduces the possibility of fines breakthrough

  • Reduced number of backwash cycles, resulting in higher production
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