CSM RE1812-80 RO Membrane Review – Best Choice for High TDS Water

If you live in an area with hard water, you know the struggle. You buy a new RO membrane, and within three months, the water flow slows down, or the taste turns salty again.

Most generic membranes sold in local markets are designed for low TDS (Total Dissolved Solids) levels—usually under 1000 PPM. But in many parts of India, groundwater TDS can spike well above 2000 PPM. Putting a standard membrane in these conditions is like driving a small car off-road; it’s going to break down.

Enter the CSM RE1812-80, manufactured by Toray Chemical Korea. It is widely considered the “gold standard” for domestic water purification in high-TDS regions.

In this guide, we’ll break down exactly why this membrane is a bestseller at The Price Challenge Store and how it saves you money in the long run.

What Does “RE1812-80” Actually Mean?

Before buying, it helps to understand the technical code so you know you are getting the right fit for your machine.

RE: Stands for Residential Element (Home use).
1812: This is the size. It is 1.8 inches in diameter and 12 inches long. This is the universal standard size, meaning it fits 99% of RO cabinets, including Kent, Aquaguard, Livpure, and assembled units.
80: This stands for 80 GPD (Gallons Per Day). While standard membranes are often 50 or 75 GPD, the CSM 80 GPD fills your tank faster, giving you about 12–15 liters of pure water every hour.

3 Reasons Why CSM Beats Generic “Chinese” Membranes

When you search for RO spares, you will see membranes selling for as low as ₹350. The Original CSM RE1812-80 costs more. Here is why it is worth the investment:

1. High TDS Handling (Up to 3000 PPM)

Generic membranes are thin. When high-pressure water with high salt content hits them, they tear or choke. The CSM RE1812-80 uses a Polyamide Thin-Film Composite material that is robust enough to handle TDS levels up to 2500 PPM (and sometimes 3000 PPM in controlled conditions) without failing.

2. 98% Salt Rejection (Sweeter Water)

The primary job of an RO is to remove dissolved salts.

Generic Membrane: 90-92% rejection. (If your input is 2000 TDS, your drinking water might still be 200 TDS).
CSM Membrane: 98% rejection. (If your input is 2000 TDS, your drinking water drops to a safe, sweet 40-50 TDS).

3. Anti-Fouling Technology

Hard water contains calcium and magnesium that form “scale” (white crust) on filters. CSM membranes feature a specialized surface structure that resists fouling. This means the membrane “self-cleans” better than cheaper alternatives, lasting 18 to 24 months instead of just 6 months.

How to Spot a Fake CSM Membrane

Because CSM is a premium brand, the market is flooded with counterfeits. When you buy from The Price Challenge Store, we guarantee 100% original stock. Here is what to look for:

The Label: Original labels have crisp, sharp printing. Fakes often look washed out.
The Serial Number: Check the unique serial number on the label which can be verified on the OEM website www.csmfilter.com OR the membrane can also be verified upon scanning the QR code present on the membrane.
The Weight: An original CSM membrane is denser and heavier due to the higher number of filtration layers (leaves) inside.

Installation Tip: Don’t Forget the Flow Restrictor!

A common mistake DIYers make is changing the membrane without changing the FR (Flow Restrictor). The FR controls the back pressure inside the housing.

For an 80 GPD membrane like the CSM RE1812-80, you should use an FR-450.
Using an old, clogged FR will destroy your new membrane in weeks.
Using an FR meant for a smaller membrane will not generate enough pressure to clean the water.

Conclusion: Is It Worth the Upgrade?

If your water source is municipal (supply) water with low TDS, a standard membrane might work. But if you rely on borewell, tanker, or hard groundwater, the CSM RE1812-80 is not just an option—it is a necessity.

It protects your health by removing heavy metals like lead and arsenic, and it protects your wallet by lasting twice as long as the cheap alternatives.

Will this fit my Kent Grand+ RO

Yes, the CSM RE1812-80 is a universal size and fits perfectly inside the membrane housing of Kent, Aquaguard, and almost all domestic RO purifiers.

My water TDS is 2200. Will this work

Absolutely. This membrane is specifically designed for high TDS water up to 3000 PPM.

Do I need a technician to install it?

Not necessarily. It is a simple “push-fit” installation. However, you must ensure you flush the first 10-15 liters of water to wash away the preservative solution before drinking.