Erkens Water - Drinking Water Filters"We Can Make Your Water Better"

Drinking Water

Warden Pro Series Reverse Osmosis System

Designed to provide crystal clear, fresh tasting water, with the added convenience of fast installation and easy maintenance! Advanced encapsulated membrane technology offers industry-leading water recovery, meaning less water down the drain, and no hassle of handling raw membrane elements. Easy access side port connection provides a cleaner appearance and shorter installation time. Every system is engineered with high quality components and an innovative design.

Warden Pro, 3 Stage RO System

  • Sediment/Carbon Pre-filter
  • RO Membrane, Encapsulated
  • Carbon Block Post-Filter


Warden Pro, 4 Stage RO System

  • Sediment Pre-Filter
  • Carbon Pre-filter
  • RO Membrane, Encapsulated
  • Carbon Block Post-Filter
    *Includes High Flow Booster Pump*

New Water Saving Technology!

Conserves Water: Twice the recovery rate over conventional RO Systems!
Encapsulated Membrane: Makes servicing fast and easy with less chance of membrane contamination.

Reverse Osmosis – How it Works!

In the reverse osmosis process, water is forced under pressure through a semi-permeable membrane to reduce the dissolved mineral content of the water. The membrane allows water molecules to pass through, but blocks/hinder the passage of dissolved substances and suspended particles. This process reduces the levels of dissolved salts, minerals, and suspended particles, while improving the taste, odor, and clarity of the water.
Certain contaminate found in water are measured as Total Dissolved Solids (TDS). Unlike the more common standard filtration systems, reverse osmosis system divide the feed water into two streams: product water (permeate) and drain/rejection water (concentrate). The product water is the desired outcome of the RO system – much cleaner and fresher tasting water! The drain/reject is vital for carrying away the dissolved salts, minerals, and suspended particles. Unlike conventional filtration systems, the majority of contaminants removed for your water are not held onto within the system, but instead flushed away.

Ion Aprx. Reject Rate  %
Aluminum 97 – 98
Ammonium 85 – 95
Bromide 93 – 96
Cadmium 93 -97
Calcium 95 - 98
Chloride 92 – 98
Chromate 85 – 95
Copper 96 -98
Fluoride 93 – 95
Iron 93 - 95
Lead 95 – 98
Manganese 97 – 98
Mercury 95 – 97
Nickel 97 – 98
Nitrate 90 – 95
Phosphate 95 – 98
Polyphosphate 96 - 98
Potassium 92 – 96
Silica 85 – 90
Silver 95 – 97
Sodium 92 – 98
Thiosulfate 97 – 98
Zinc 97 - 99

Feed Water Parameters
  Warden Pro Warden Pro LP
Pressure 45 – 100 psi 20 – 60 psi
Temperature 40 – 90 F 40 – 90 F
Max TDS 1,800 ppm 1,800 ppm
Hardness <10 gpg <10 gpg
Iron <0.5 ppm <0.5 ppm
pH Range 3.0 – 11.0 3.0 – 11.0
*Feed water must be potable and not of unknown quality

Nitrates and Reverse Osmosis Systems

Nitrates are a form of nitrogen and are a natural part of soil and groundwater. Fertilizer, septic systems and manure can increase nitrate levels beyond EPA's water standards. According to a Saint Cloud Times article some local areas (Becker, Clear Lake, Cold Spring) have increased nitrate levels. Nit ate contamination in drinking water affect a persons blood ability to carry oxygen. The most vulnerable are infants, pregnant women and certain adults. The EPA's maximum drinking water standard is 10 milligrams per liter. The two methods that will remove nitrates are Reverse Osmosis systems and Distillations systems.