Please note:

This FAQ document provides general information only, without any guarantee. The buyer of our products is responsible and liable that the Caripur products apply to the necessary standards in the country of installation/purification.

General Information

1. What makes the Caripur unique?

  • Nanofiltration-based portable water purifier
  • Can run from grid, generator, or solar power (requires backup battery)
  • Sustainable solution,100% organic cleaning solution does not produce poisonous soup from acid or alkyne use
  • Low operation and maintenance costs, no skill required, and no replacement of internal parts required for years if properly maintained
  • Compact and complete system; can be carried by two people, or wheeled by one, and set up in less than one minute
  • Back-flushing is accomplished by simply turning knobs to redirect water

2. How does the Caripur work?

The Caripur is a portable system used to treat contaminated water from fresh water sources, utilizing membrane technology to present a physical barrier to prevent the passage of organic and inorganic material.

3. How reliable is the Caripur?

All of the Caripur units are equipped with the components and membranes that are made in the USA in ISO 9001:2008 certified facilities, meet MIL-STD-810F specifications, and designed for continuous run.

4. Who can benefit from using the Caripur?

It can be used in emergency disaster recovery, in remote areas without reliable infrastructure (poor water), and for military use.

5. What kind of weather conditions can the Caripur withstand?

The Caripur is built to operate under harsh climate conditions, including from deserts to very humid regions.

We customize the units for their specific geography, and we provide all commensurate attachments for said environments. Water temperature cannot, however, exceed 113F (75◦ C).

6. How much does the Caripur cost?

Depending on the type of unit, the required amount of water, the amount of power supply, and additional features, the price can vary. Please contact us directly for pricing.

7. What are the units made of?

The units reside inside of custom-formed, high-strength polymer cases, which are engineered to protect the components from the harshest conditions. The units are specially designed and manufactured to work outdoors and under harsh weather conditions. However, some form of protection (a roof or indoor installation, or a storage facility) can extend the life of the unit. We provide our units assembled in standardized Uni-Pak 40″ x 48″ x 45″ pallet pack containers.

8. How is rejected water disposed of?

The Caripur produces rejected liquid and varies depending upon how frequently a flush is required. As a general rule, we suggest 5% of the water is rejectant. Since our system does not use acid and antiscalant dosing, the concentration of concentrate is not very high and can be used directly for irrigation. However, use for irrigation depends on the type of salt present in the rejected streams and the concentration of salts. If rejected streams contain heavy metal salts such as chromium salts, then this water cannot be used for irrigation.

Alternatively, placement into an open-air pit or hole to dewater the rejectant can be done so that it is in a more concentrated form for disposal once the water has evaporated.

9. How do you start up the unit after a period of sitting?

There are times when the unit is standing for a day and bacteria might form on the permeate port. While the Caripur has
bacteria-resistant components and tubing, it is recommended to use the recirculation hose to clean the permeate (outlet) end of the unit. Attach it to both ends after ensuring the system is primed and turn the power switch to “clean” for 2 to 3 minutes. Then disconnect, and resume the process.
*Be sure the sanitize both ends or the recirculation hose.

10. What about relocation of the units?

All of the Caripur units are mobile, and can easily be relocated using two people carrying the handles, or the telescopic handle utilizing the wheels on the case. The shipping containers are also mobile.
*insure end-caps remain attached when moving the units to insure no water spillage.

11. Does the Caripur come with warranty?

Yes, we provide detailed information about the different components’ warranty within our quotations, and at the bottom of the website.

12. What is the difference between Caripur, Caripur “P”, and Caripur “I”?

The Caripur™ is the powered unit that can remove elements down to .02 microns (viruses, bacteria, cysts, etc.), producing microbiologically clean water at a rate of up to 10 gpm (37 lpm). The Caripur™ “P” is an attachment to the Caripur™ and further purifies the water to .0002 microns (heavy metals, color, odor, flavor) at the same rate. The Caripur™ “I” combines the capabilities of the previous two units in one box, but only produces (currently) 5 gpm (19 lpm).

Water Production

1. What is the capacity?

Capacity depends on the type of unit.

  • Caripur  upto 600 gph [2271 l/h]
  • Caripur “P” up to 600 gph [2271 l/h]
  • Caripur “I” up to 180 gph [681 l/h]

2. What affects the amount of water produced?

The amount of water that can be treated depends mainly on the following issues:

1) Turbidity, which is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, only affects it insomuch that the unit might require more frequent purging in highly turbid water.

2)Concentration polarization which is A layer is formed near the surface of the membrane, whereby the solution immediately adjacent to the membrane surface becomes depleted in the permeating solute on the feed side of the membrane. This is corrected by backflushing, and in more extreme instances the use of our organic solution to break apart the polysaccharide structures

3) Power availability

3. What is the minimum pressure for back-flushing?

Our pumps provide the appropriate pressure; however, it is approximately 2 bar.

4. What is the pressure of the product (permeate) water?

Approximately 5 to 6 bar, depending on the unit and contamination.

5. Is there any pressure metering within the unit?

Yes, there is a single meter on the unit. For more information, please see our Caripur Operation Manual.

6. How does the Caripur back-flush?

Backward flush is a reversed filtration process. Permeate is flushed through the system under pressure, floating the material and forcing it out.

7. Are chemicals required to treat the water?

No chemicals are required.

8. How does the Caripur handle concentration polarization?

Our units are low pressure, so that assists in reducing the effect. In addition, we reduce concentration at the contact surface by reducing solids in the feed with the use of external filtration when necessary.

9. How does the Caripur handle reversible vs irreversible fouling?

Reversible fouling is performed by a backwash; irreversible fouling is handled with our 100% organic cleaning solution, which breaks apart the polysaccharide structures that hold the particles on the membrane surface together.

Raw Water and Product Water Quality

1. Can the Caripur remove arsenic (As)?

Yes, the nanofiltration membrane (NaCl rejection 99.6%) could remove over 95% of As(V) under the Caripur “P” and its relatively low applied pressure.

2. Can the Caripur remove salt?

Yes, the Caripur™ can be configured to remove between 75% and 95% of salt.

3. Can the Caripur™ treat brackish or salt water?

Not, currently, however we have designs on the drawing board for both brackish and salt water.

4. What is the maximum turbidity to treat water with a Caripur™ water system?

The maximum turbidity is 28.

5. What is the product water quality?

The Caripur is 99+% free of pathogens. The Caripur™ “P” and “I” units are 99.+% free of pathogens, and color, odor, flavor, a high percentage of heavy metals, and multivalent ions.

6. Can Caripur™ treat gray water?

Yes, but the units will need to be configured for it.

7. How can Caripur™ guarantee safe drinking water?

Caripur™ cannot guarantee safe drinking water as such. We provide the technical equipment to treat contaminated water and remove contamination from raw water. Regular measurement of the product water, however, remains the responsibility of the end user.

Filtration Technologies

1. What is ultrafiltration?

Ultrafiltration is a type of membrane filtration in which forces like pressure or concentration gradients lead to a separation through a semipermeable membrane. Suspended solids and solutes of high-molecular-weight are retained in the so-called retentate, while water and low-molecular-weight solutes pass through the membrane in the permeate.

2. What is nanofiltration?

Nanofiltration (NF) is a pressure-driven membrane process for liquid-phase separations. NF has replaced reverse osmosis (RO) in many applications due to lower energy consumption and higher-flux-rate salts. The properties of NF membranes lie between those of non-porous RO membranes (where transport is governed by a solution-diffusion mechanism) and porous ultrafiltration membranes (where separation is usually assumed to be due to size exclusion and, in some cases, charge effects).

3. What is an activated carbon filter?

Granular activated carbon is commonly used for removing organic constituents and residual disinfectants in water supplies. This not only improves taste and minimizes health hazards; it protects other water treatment units such as reverse osmosis membranes and ion exchange resins from possible damage due to oxidation or organic fouling. Activated carbon is a favored water treatment technique because of its multifunctional nature and the fact that it adds nothing detrimental to the treated water.

4. What is brackish water?

Brackish water is either slightly salty or contaminated with dissolved solids and therefore is not drinkable for humans. Brackish water is metered with a total dissolved solids (TDS) level that ranges from 1,000 to approximately 15,000 TDS.

5. What is TDS?

Total dissolved solids (TDS) comprise inorganic salts (principally calcium, magnesium, potassium, sodium, bicarbonates, chlorides, and sulfates) and some small amounts of organic matter that are dissolved in water.

6. What is PPM?

PPM (parts per million) is a measurement for water quality or salinity.

7. What is gray water?

Gray water is gently used water from your bathroom sinks, showers, tubs, and washing machines. It is not water that has come into contact with feces, either from the toilet or from washing diapers. Gray water may contain traces of dirt, food, grease, hair, and certain household cleaning products.


1. How much water does the pump deliver?

The Caripur pump delivers up to 600 gph (2,271 l/h) of water.

We also provide pumps for larger volumes. Please contact us for further information.

2. What is the maximum depth for water pumping?

Our standard tubing package includes 10 feet (3 meters) of hose. In case of deeper wells or boreholes, other pumping equipment is available.

Power Supply

1. How much power is required to operate the unit?

The power consumption depends on the type of unit. Please see our factsheets.

2. Is it possible to run the Caripur with grid power or a generator?

Yes. However, an additional inverter can be delivered within the unit, if this is not already integrated.


1. What kind of maintenance does the Caripur require?

Maintenance of the Caripur is performed through back-flushing the unit when the permeate flow has dropped 10% or more below its standard flow. Additionally, our organic cleaning solution can be used if back-flushing fails to return the flow back to the normal rate.

2. Do the units require maintenance by a skilled person?

No, the maintenance outlined above can be performed by anyone capable of operating the unit and reading the instructions.

3. How long does the Caripur last?

The Caripur is built to last for years. However, the life of a Caripur is dependent on regular and proper maintenance of the unit.

4. Which filters need replacement?


Our units are equipped with a pre-filtration system, which can be back-flushed. On occasion, cleaning by hand of the external gravel and plant matter filters is recommended.

From time to time, our 100% organic treatment of the membrane is recommended. For longer storage of the unit, our 100% organic treatment is necessary.