IceCap Dow Filmtec 100GPD Reverse Osmosis Membrane
SKU: IP-RI-FT1812100
- The Dow Filmtec TW30-1812-100HR is a 100 GPD thin film composite RO membrane for standard 2in x 12in pressure vessels.
- It is designed as a drop-in replacement membrane for home RO and RO/DI systems used in reef and freshwater aquariums.
- It rejects 96-98% of dissolved solids and is rated at 50 PSI, producing more purified water per PSI than membranes rated at 60 PSI.
- NSF/ANSI Standard 58 listed; compatible with IceCap RO systems and any standard 1.75in x 11.74in membrane housing.
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Dow Filmtec 100 GPD Thin Film Composite RO Membrane for Aquarium Use
The Dow Filmtec TW30-1812-100HR is a 100-gallon-per-day thin-film composite (TFC) reverse osmosis membrane for hobbyists replacing a worn membrane in an existing RO or RO/DI system. It fits any standard pressure vessel sized for a 1.75in x 11.74in element, including IceCap RO systems and virtually every other brand using the common 2in x 12in housing format.
The membrane is rated at 96-98% TDS rejection and is tested and listed to NSF/ANSI Standard 58 for drinking water systems. It is rated at 50 PSI operating pressure, which means it produces approximately 20% more purified water per PSI than competing membranes rated at 60 PSI — a meaningful efficiency advantage for hobbyists managing waste water ratios.
Chlorine will destroy a TFC membrane. If your feed water is chlorinated municipal water, a carbon block pre-filter must be installed upstream of the membrane before putting this element in service. Actual production output will vary based on water temperature, feed pressure, and TDS levels.
Key Features:
- 100 GPD production rate at standard test conditions
- 96-98% TDS rejection rate
- Fits standard 1.75in x 11.74in pressure vessels used in IceCap and most other RO systems
- Rated at 50 PSI; produces more purified water per PSI than membranes rated at 60 PSI
- NSF/ANSI Standard 58 listed for drinking water applications
- Thin film composite (TFC) construction; requires chlorine-free feed water
Ideal For:
- Hobbyists replacing a spent or chlorine-damaged membrane in an existing RO or RO/DI system
- Reef and freshwater aquarium keepers who need consistent low-TDS source water for top-off or water changes
- Anyone upgrading from a lower GPD membrane and wanting more daily production from the same housing
Pro Tips:
- Always run a carbon block pre-filter upstream of this membrane. Residual chlorine in municipal water will irreversibly damage the TFC membrane. Do not install this membrane without confirmed chlorine or chloramine removal upstream.
- Flush the membrane before putting it in service. Run the RO system to drain for at least 30 minutes after installing a new membrane to flush manufacturing residues before directing output to your DI stage or aquarium.
- Lower water temperature reduces production output. TFC membranes produce significantly less water in cold conditions. If your tap water runs cold in winter, expect reduced daily output and plan water change schedules accordingly.
- Test TDS before and after the membrane on each water change. A TDS meter across the membrane is the fastest way to detect membrane degradation before it affects your aquarium. A rising post-membrane TDS reading is the signal to replace.
What's Included:
1x Dow Filmtec TW30-1812-100HR RO membrane element
Specifications:
- SKU: IP-RI-FT1812100
- Production Rate: 100 GPD (at standard test conditions)
- TDS Rejection Rate: 96-98%
- Element Size: 1.75in diameter x 11.74in length
- Housing Compatibility: Standard 2in x 12in pressure vessel
- Rated Operating Pressure: 50 PSI
- Membrane Type: Thin Film Composite (TFC)
- Certification: NSF/ANSI Standard 58 listed
- Feed Water Requirement: Chlorine-free; requires carbon pre-filtration on chlorinated municipal water
Warranty
CoralVue, Inc. hereby guarantees this product to be free from defects in material and workmanship for a period of:
- 1 Year
Warranty is activated on the date of purchase.
This Standard Limited Warranty applies and is limited as follows:
- To the product only as long as it remains in the possession of the original purchaser.
- To the product that has not been subject to accident, misuse or abuse.
- To the product that has not been modified, altered, defaced, or had repairs made or attempted by other than CoralVue, Inc.
- That CoralVue be immediately notified in writing within ten (10) days of first knowledge of defect by owner or his agent.
- That CoralVue, Inc. shall be given first opportunity to make any repairs, replacements or corrections to the defective construction within a reasonable period of time.
- Under no circumstances shall CoralVue and/or the Manufacturer be liable by virtue of this warranty or otherwise for damage to any person or property whatsoever for any special, indirect, secondary or consequential damages of any nature however arising out of the use or inability to use because of the product defect.
Instructions:
- Confirm that a carbon block or GAC pre-filter is installed and functional upstream of the membrane housing. Do not install this membrane on chlorinated or chloramine-treated water without pre-filtration.
- Remove the membrane housing cap or end plug from your RO system's pressure vessel.
- Slide out the old membrane element and discard it.
- Insert the Dow Filmtec TW30-1812-100HR element into the housing with the correct flow orientation (brine seal end first into the housing; refer to your RO system's manual if unsure).
- Reinstall the housing cap and hand-tighten.
- Restore feed water pressure to the system.
- Flush the system to drain for a minimum of 30 minutes before directing permeate output to your DI stage or aquarium.
- Test the permeate TDS output after flushing to confirm the membrane is seated and rejecting correctly.
- Monitor TDS across the membrane periodically; replace the element when rejection rate degrades noticeably.