A standard 1812-size, 100 GPD thin-film composite (TFC) reverse osmosis membrane — the balanced everyday choice for MyWaterClub countertop RO and standard under-sink systems.

100 GPD RO membrane — application & use

A 100 GPD (gallons per day) reverse osmosis membrane is one of the most commonly used sizes in residential RO. It balances production speed and contaminant rejection, making it a strong everyday choice for both countertop RO systems and standard under-sink RO systems (with or without a storage tank).

This membrane is fully compatible with MyWaterClub Countertop RO systems. Compared with lower-GPD membranes, a 100 GPD membrane produces water faster while keeping strong rejection performance — a popular middle-ground for daily household drinking water.

What it reduces

Like other TFC (thin-film composite) membranes, it works by rejecting dissolved substances at the molecular level — reducing entire classes of dissolved impurities rather than targeting individual chemicals. Typical reductions include:

• ✓Total Dissolved Solids (TDS)
• ✓Fluoride
• ✓Heavy metals (lead, arsenic, mercury, chromium)
• ✓Nitrates and nitrites
• ✓Dissolved salts and minerals (calcium, magnesium, sodium)
• ✓Many dissolved inorganic and synthetic compounds

Actual performance depends on feed-water quality, pressure, temperature, and proper pre-filtration. Not all contaminants are present in every water source.

What does “100 GPD” mean?

GPD (gallons per day) is the maximum purified water the membrane can produce under ideal laboratory conditions — roughly 77°F (25°C) water, ~60 psi pressure, and low TDS. In real-world home use, production is typically lower because temperature, pressure, and feed-water TDS all vary.

*Rated output reflects ideal lab conditions (GPD ÷ 24). Real-world production is typically lower and varies with feed-water pressure, temperature, TDS, and system configuration.

Why choose 100 GPD?

A 100 GPD membrane suits users who want faster water production while keeping strong filtration. It’s often the middle-ground pick between slower high-efficiency membranes and higher-output membranes. It may be ideal if you:

• ✓Use a countertop RO system without a storage tank
• ✓Use a standard under-sink RO system (with or without a tank)
• ✓Want a good balance between flow rate and rejection performance
• ✓Need reliable daily drinking-water production

Compatibility & installation

Because it uses the standard 1812 size (and the same housing accepts 2012), it fits a wide range of residential RO systems:

• ✓Standard RO membrane housings (accept both 1812 and 2012)
• ✓MyWaterClub Countertop RO systems
• ✓Standard under-sink RO systems (tank-based or tankless)
• ✓A drop-in upgrade for systems originally built around a 75 GPD membrane (faster output, same 1812 fit)

Maintenance & replacement

• Typical lifespan: 2–3 years, depending on water quality and pre-filtration.
• Replace sooner if water production slows or TDS reduction drops off.
• Replacing sediment and carbon pre-filters on schedule helps extend membrane life.
• After installing a new membrane, run and discard the first batch of water, then let the system settle in for a few days before relying on your TDS reading.

Specifications

Typical contaminant reduction

Typical categories reduced by a standard RO membrane, with average reduction ranges commonly observed in residential systems.

*Ranges represent typical performance for standard residential TFC reverse osmosis membranes. Actual results vary with feed-water quality, pressure, temperature, membrane condition, and pre-filtration. Not all contaminants are present in every water source. This is membrane-technology reference data, not a certified per-unit claim.

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