Dow Filmtec 100 GPD RO Membrane (TW30-1812-100HR)

The industry-standard 100 GPD RO membrane. This genuine DOW Filmtec TW30-1812-100HR is the most widely used 100 gallon-per-day reverse osmosis membrane in the aquarium hobby. It delivers a 98% rejection rate that strips chlorine byproducts, heavy metals, silicates, phosphates, and other dissolved solids out of your tap water. Clean RO/DI water is the foundation of a healthy reef or planted tank, and this element is a direct fit for most standard RO and RO/DI systems. Round out your water room with the rest of our water care gear.

Why this membrane

• Produces 100 gallons per day at 50 PSI with a 98% salt rejection rate
• The most common 100 GPD membrane in the aquarium industry, a direct replacement for most systems
• Thin-film composite (TFC) element, ANSI/NSF 58 listed
• Standard 1.8 x 12 inch size fits most RO and RO/DI housings
• Removes chlorine byproducts, heavy metals, silicates, phosphates, and dissolved solids for pure top-off and salt-mixing water

Specifications

Install and use tips

• Match your flow restrictor to the membrane: a 100 GPD element uses an approximately 800 ml/min restrictor.
• New membranes ship with a protective preservative, so run the system and discard the first hour of water before using it.
• You get the best output at 50 to 80 PSI; a booster pump helps if your feed pressure is low.
• Protect the membrane with fresh sediment and carbon prefilters to make it last.

Frequently Asked Questions

Will it fit my system? Yes for most standard RO and RO/DI systems that use a 1.8 x 12 inch membrane. You may need an 800 ml/min flow restrictor to hit the full 100 GPD rate.

How long does a membrane last? Typically 2 to 3 years with good prefilters, depending on your source water and how much you produce.

Freshwater or saltwater? Both. RO/DI water is ideal for reef, marine, and planted freshwater tanks alike.

Do I need to flush it first? Yes. Discard the first hour of production to rinse off the factory preservative before you store or use the water.