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FilmTec 1812-75 GPD Membrane – Domestic Reverse Osmosis Membrane
₺2,991.86
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- SKU
- WP-MB-016
- Category
- RO Membranes, Water Filters, Water Treatment Spare Parts
FilmTec · 1812 Size · 75 GPD
Steady Output in Domestic Units with the FilmTec 1812-75 GPD Membrane
The FilmTec 1812-75 GPD membrane is a 1812-size membrane element of polyamide thin-film composite construction, used in under-sink reverse osmosis units for homes and offices. According to the manufacturer’s data it delivers 75 gallons, or approximately 284 litres, of product water per day at 50 psi (3.4 bar). With a length of 298 mm and a diameter of 44.5 mm it fits a nominal 2 inch membrane housing; it is shipped dry.
- Rated Output
- 75 GPD
- Test Pressure
- 3.4 Bar
- Housing Fit
- Nominal 2"
01Problem & Solution
A Tired Membrane Means Less Water
Problem
The Tank Fills Slowly and the Water Changes
Over time a reverse osmosis membrane becomes fouled with sediment, limescale and organic matter, while chlorine permanently damages the polyamide surface. With a tired membrane the tank takes longer to fill and the TDS of the product water rises. Even if the pre-filters are changed, the unit does not return to its former output unless the membrane itself is renewed.
Solution
A Replacement Element Defined by Manufacturer Data
The FilmTec 1812-75 GPD membrane is an element whose test conditions, output rating and operating limits are defined in the manufacturer’s data sheet. With its standard 1812 size it fits into the same housing in place of the old membrane. Renewed together with the pre-filters, it helps the unit return to the output level it was designed for.
02Key Features
A Standard Element for Domestic RO
The FilmTec 1812-75 GPD membrane offers, in a single element, the size and output rating that standard domestic reverse osmosis units need.
75 GPD Rated Output
At a test pressure of 50 psi (3.4 bar) it delivers 75 gallons, approximately 284 litres, of product water per day.
Standard 1812 Size
With a length of 298 mm and a diameter of 44.5 mm it fits membrane housings with a nominal 2 inch inner diameter.
Polyamide Thin-Film Composite
The thin-film layer lets water through and leaves most of the dissolved salts to the concentrate line.
17 mm Product Water Tube
The central tube, with a 0.68 inch (17 mm) inner diameter, carries the treated water to the product water outlet of the housing.
Dry Shipping
The element is shipped dry, which makes transport and storage easier.
Wide pH Range
It can be used within pH 2–11 in continuous operation and pH 1–12 for short-term cleaning.
03Technical Specifications
Membrane Specifications
| Feature | Value | What it does |
|---|---|---|
| Brand | FilmTec | The manufacturer. The valve and membrane brand decides how easily spares can be found. |
| Model | 1812-75 | The manufacturer’s model code. Spares and service are matched by this code. |
| Product Type | Domestic RO Membrane Element | The product family it belongs to. When buying a spare, the family alone is not enough; the size and model must match too. |
| Membrane Type | Polyamide Thin-Film Composite | The structure of the membrane. Chlorine burns it, so a carbon filter in front is essential. |
| Daily Output | 75 GPD (≈284 Litres) | How much treated water it produces in a day. |
| Test Pressure | 50 psi (3.4 bar) | |
| Test Water | 250 ppm Softened Mains Water | |
| Test Conditions | 25 °C · 15% Recovery | |
| Size | 298 × 44.5 mm (11.74" × 1.75") | The physical size. If a spare does not match this, it will not go into the housing. |
| Product Water Tube | 17 mm (0.68") Inner Diameter | |
| Compatibility | Nominal 2" Membrane Housing | Which units and housings it works with. Compare it with yours before ordering. |
| Maximum Temperature | 45 °C | |
| pH (Continuous) | 2 – 11 | |
| pH (Short-Term Cleaning) | 1 – 12 | |
| Maximum SDI | 5 | |
| Free Chlorine | < 0.1 ppm | |
| Shipping | Dry |
04Applications
Where Is It Used?
The FilmTec 1812-75 GPD membrane is used in reverse osmosis units with 1812 membranes in homes and small offices with standard consumption.
Under-Sink RO SystemsDomestic Water PurifiersHomes with Standard ConsumptionSmall OfficesUnits with 1812 MembranesMains Lines with Carbon FiltersPeriodic Membrane RenewalSpare for Technical Service
05How It Works
How Does the FilmTec 1812-75 GPD Membrane Work?
FilmTec is DuPont’s reverse osmosis membrane brand; series and brand information is available on DuPont’s FilmTec page. Domestic elements work on the principle of reverse osmosis: water is passed under pressure through a semi-permeable membrane and is split in two, as product water and concentrate.
-
It Passes Through the Pre-Filters
Mains water first passes through the sediment and activated carbon filters; coarse particles and free chlorine are held back before they reach the membrane.
-
It Enters the Housing Under Pressure
The water is delivered to the 2 inch membrane housing by mains pressure or the unit’s pump and spreads across the surface of the element.
-
Separation in the Thin-Film Layer
Water molecules pass through the polyamide layer; most of the dissolved salts remain on the membrane surface.
-
Product Water Leaves Through the Central Tube
The treated water collects in the central tube with a 17 mm inner diameter and goes to the tank through the product water outlet of the housing.
-
The Concentrate Goes to the Drain
The substances held back by the membrane are discharged to the drain through the waste line together with the concentrate.
06Making the Right Choice
Is the FilmTec 1812-75 GPD Membrane Right for Your Unit?
When choosing the FilmTec 1812-75 GPD membrane, the housing size, the capacity the unit was designed for, the mains pressure and daily consumption are assessed together.
Housing Size
The element is 1812 size and fits a nominal 2 inch housing; compare it with the size printed on the old membrane.
Unit Capacity
If the unit runs on a 75 GPD membrane, the same rating is kept; when switching to a different GPD rating, the waste water flow restrictor and the pump should be checked for compatibility.
Mains Pressure
The rated output is measured at 3.4 bar; on lines where the pressure is below this, daily output also falls.
Daily Consumption
On lines with high consumption or low pressure, the FilmTec 1812-100 GPD Membrane may be more suitable.
07Maintenance and Use
Notes That Protect Membrane Life
The FilmTec 1812-75 GPD membrane works efficiently when pre-treatment is carried out regularly and the manufacturer’s limits are observed.
- Before fitting, shut off the water to the unit; push the element fully into the housing seat and close the cap so that it seals.
- When putting it into service for the first time, do not use the water produced in the first hours; send this water to the drain.
- Change the activated carbon pre-filter on time; if free chlorine is not kept below 0.1 ppm, the polyamide layer is permanently damaged.
- Make sure the water temperature does not exceed 45 °C; do not connect the unit to a hot water line.
- If the tank filling time becomes noticeably longer or the TDS of the product water rises, have the pre-filters checked first, then the membrane.
08Frequently Asked Questions
Common Questions
What does the FilmTec 1812-75 GPD membrane do?
It is the main treatment stage of a domestic reverse osmosis unit. As the water that has passed through the pre-filters crosses the polyamide thin-film composite layer, most of the dissolved salts are separated into the concentrate line. Under the manufacturer’s test conditions the element delivers 75 gallons of product water per day at a pressure of 3.4 bar.
How many litres of water does it produce per day?
75 GPD means approximately 284 litres per day. This value is measured under test conditions of 250 ppm, 25 °C and 3.4 bar and may vary by ±20% from element to element. If the mains pressure and water temperature at home are lower, daily output will also be below this value.
Which housing does it fit?
The FilmTec 1812-75 GPD membrane is 298 mm long and 44.5 mm in diameter; it fits membrane housings with a nominal 2 inch inner diameter. Before ordering, we recommend comparing it with the size printed on the old membrane.
Why is an activated carbon pre-filter needed?
The free chlorine tolerance of the polyamide membrane is below 0.1 ppm. If chlorine in the mains water reaches the membrane, the surface is permanently damaged; the activated carbon pre-filter holds back the chlorine before the membrane.
What does being shipped dry mean?
The FilmTec 1812-75 GPD membrane is sent from the factory dry, which makes transport and storage easier. After it is fitted to the unit and run with water for the first time, the water produced in the first hours is not used but sent to the drain.
Does the membrane come with a warranty?
Units, valves, pumps and tanks carry a 2-year warranty and taps a 1-year warranty. Filters, membranes, resin and salt are consumables and fall outside the warranty.
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Warranty
ConsumableThis product is classed as a consumable or spare part; because its life depends on use, it is not covered by warranty. Faulty or incorrectly shipped items are replaced — just get in touch with us.
Withdrawal and returns
Distance sales agreementThe right of withdrawal and the return terms are set out in detail in the distance sales agreement. Systems that have been installed and commissioned, and made-to-order products, are outside its scope.
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