Posts Tagged ‘brackish water treatment’

Membranes, Filmtec Membranes, Hydranautics, Toray and Koch Membranes

Pure Aqua

DOW / FilmTec


Koch / Fluid Systems


Membranes – Reverse Osmosis, Filmtec, Hydranautics and Koch Membranes

Crossflow membrane filtration is a pressure-driven separation process. Application: Industrial, food, water, chemical, and biotechnology markets, as well as for those providing environmental protection.

Membranes serve as highly-engineered, physical barriers that permit the passage of materials only up to a certain size, shape or character. Pure Aqua offers reverse osmosis membranes, filmtec membranes, koch membranes, and Hydranautics membranes in a variety of configurations, materials and sizes; each designed to meet specific application needs

There are four main membrane separation processes currently employed for liquid/liquid and liquid/solid separation: microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO).

Spiral wound products have become the most commonly used membranes for industrial water applications such as boiler make-up water, brackish water treatment, seawater desalination, microelectronics and pharmaceutical water applications. These membranes are available as UF, NF and RO.

What is Semi-permeable Membrane?

Semi-permeable membrane refers to a membrane that selectively allows certain species to pass through it while retaining others. In actuality, many species will pass through the membrane, but at significantly different rates. In RO, the solvent (water) passes through the membrane at a much faster rate than the dissolved solids (salts). The net effect is that a solute-solvent separation occurs, with pure water being the product. (In some cases, dewatering is desired to concentrate the salts).

What is Osmosis?

Osmosis is a natural process involving the fluid flow of across a semi-permeable membrane barrier. Consider a tank of pure water with a semi-permeable membrane dividing it into two sides. Pure water in contact with both sides of an ideal semi-permeable membrane at equal pressure and temperature has no net flow across the membrane because the chemical potential is equal on both sides. If a soluble salt is added on one side, the chemical potential of this salt solution is reduced. Osmotic flow from the pure water side across the membrane to the salt solution side will occur until the equilibrium of chemical potential is restored. In scientific terms, the two sides of the tank have a difference in their “chemical potentials,” and the solution equalizes, by osmosis, its chemical potential throughout the system. Equilibrium occurs when the hydrostatic pressure differential resulting from the volume changes on both sides is equal to the osmotic pressure. The osmotic pressure is a solution property proportional to the salt concentration and independent of the membrane.

Pure Aqua, Inc. is a wholesalers’ of the reverse osmosis membranes, Hydranautics membranes, filmtec membranes (dow membranes), koch membranes, toray membranes, to get more info visit Reverse Osmosis Systems..


RO-400 – Industrial Reverse Osmosis

28k to 173k GPD Brackish Water ROIndustrial Reverse Osmosis / RO-400

Reverse osmosis, also known as hyper filtration, is used to purify water and remove salts and other impurities. It is also capable of rejecting bacteria, sugars, proteins, particles, dyes, and other constituents that have a molecular weight of greater than 150-250 dalton.


  • 8” TFC spiral wound membranes
  • FRP membrane housing
  • Epoxy painted steel frame
  • Stainless steel multi-stage pump with TEFC motor
  • 5 micron cartridge prefilter
  • Power supply: 460V/3Ph/60Hz
  • PLC based control panel
  • Programmable time delay and set points
  • Status lamps
  • 115V/60Hz control voltage
  • Motor starter
  • NEMA 12 enclosure with disconnect and interlocking rotary handle
  • Low pressure switch
  • High pressure switch
  • Liquid filled pressure gauges, panel mount for pump suction, membrane feed, and final concentrate
  • Permeate conductivity monitor
  • Permeate & concentrate flow meters
Model No. Permeate HPP @ 3 years Membranes Approx Wt. (Lbs)
GPD GPM PSI HP (50Hz) HP (60Hz) Qty. Array
TW-28K-1480 28,800 40 240 7.5 10 4 1 2,300
TW-36K-1580 36,000 44 225 10 10 5 1 2,400
TW-43K-1680 43,000 48 225 15 10 6 1 2,500
TW-57K-2480 57,000 57 230 15 15 8 1:01 2,600
TW-72K-2580 72,000 67 250 20 15 10 1:01 2,700
TW-87K-3480 87,000 83 230 20 20 12 2:01 2,800
TW-108K-3580 108,000 100 235 25 25 15 2:01 3,200
TW-130K-3680 130,000 120 235 25 25 18 2:01 3,500
TW-144K-4580 144,000 134 235 25 25 20 2:02 4,200
TW-173K-4680 173,000 160 230 25 25 24 3:01 4,750

For More Information: Industrial Reverse Osmosis