RO Membrane & Membrane Housing Price in Kenya 2026: 2521, 4040 and 8040 Explained

When an RO plant starts producing less water or the water tastes salty, the membrane or pre-filters usually need attention. This guide covers RO membrane and membrane housing prices on Buy More Mall and how to pick the right size.

What Do 2521, 4040 and 8040 Mean?

The code is the membrane size in inches: the first two digits are the diameter and the last two the length. A 4040 is 4 inches wide and 40 inches long. An 8040 is 8 by 40 and makes several times more water than a 4040. A 2521 is 2.5 by 21, for small systems. The housing must match the membrane size.

RO Membrane Prices

Other sizes and brands: H-TECH RO Membrane Replacement Range.

Stainless Steel Membrane Housing Prices

FRP Membrane Housing Prices

The "-1", "-2" and so on at the end is the number of membranes the housing holds in series.

End Port or Side Port?

• End port: the water connections are on the end caps. Simple and cheaper, common on small and medium plants.
• Side port: connections are on the side of the tube, so housings can be stacked and piped neatly on a rack, and the end caps can be removed without taking the pipework apart. Common on larger plants.
• Stainless steel housings look neat and are strong. FRP housings do not rust and are the usual choice for 8040 membranes and salty water.

Pre-filters and Instruments

The cartridge filters before the membrane protect it. Change them on time or the membrane will clog.

When to Replace an RO Membrane

• Product water TDS rises and stays high after cleaning.
• Output falls a lot even after changing the pre-filters and cleaning.
• The pressure difference across the membrane keeps rising (fouling or scaling).

Good pre-treatment and regular cleaning make membranes last much longer. See the RO System Maintenance Guide.

Not sure which one fits? Send us your details on WhatsApp or through the product page and we will help you choose.

Frequently Asked Questions

How much is a 4040 RO membrane in Kenya?

From KSh 23,670 for the LP-4040 to KSh 33,405 for the LP21-4040 on Buy More Mall.

How much is an 8040 RO membrane in Kenya?

The LP-8040 membrane is KSh 102,570.

What does 4040 mean on an RO membrane?

4 inches in diameter and 40 inches long.

How often should I change RO pre-filters?

It depends on water quality and use. Commercial plants often change sediment cartridges every 1 to 3 months. Change them when the pressure drop rises.

Prices shown are regular prices on Buy More Mall. Many products are currently on offer, so open the product page to see today's price.

Related Guides

• RO System Maintenance Guide
• Industrial RO Plant Price
• RO Water Purifier Price
• FRP Tank Sizes & Prices
• UV Water Sterilizer Price

Browse the range in RO Membranes & Housings.