Maintain the filtration performance of your Aquafilter EXCITO-ST under-sink water filtration system with the Aquafilter EXCITO-ST-CRT Four-Piece Replacement Cartridge Set.

Designed specifically for the EXCITO-ST system, this replacement set combines sediment filtration, water softening, activated carbon and KDF media to provide multiple stages of drinking water treatment.

The four cartridges work together to reduce suspended particles, chlorine, selected organic contaminants, iron and certain heavy metals, while helping to reduce water hardness and improve the taste and aroma of filtered water.

Featuring 1/4-inch NPT connections, the cartridges are designed to replace the original inline filters without replacing the complete under-sink filtration system.

Four stages of replacement filtration

The EXCITO-ST-CRT contains four specialist cartridges, each performing a different filtration function.

Stage 1 – AIPRO-20M-AQ sediment filter

The first stage uses polypropylene filtration media with a nominal 20-micron rating.

It helps reduce suspended particles, including:

• Sand

• Rust

• Silt

• Sediment

• Other suspended solids

This initial filtration stage helps protect the subsequent cartridges from larger particles.

Stage 2 – AISTRO-L-AQ water softening cartridge

The second stage contains ion-exchange media designed to reduce water hardness.

It helps reduce dissolved calcium and magnesium ions, which contribute to scale formation. This conditioning stage can improve the characteristics of hard water before it passes through the remaining filtration stages.

Benefits include:

• Reduction of water hardness

• Reduced scale-forming potential

• Improved water conditioning

• Additional treatment of water before carbon filtration

Actual softening performance depends on incoming water hardness, water consumption and cartridge condition.

Stage 3 – AICRO-L4-AQ activated carbon and KDF filter

The third stage combines granular activated carbon with KDF filtration media.

The activated carbon is designed to reduce free chlorine and selected organic compounds, helping improve the taste and smell of drinking water.

KDF media provides additional treatment of certain dissolved metals and has bacteriostatic properties that help inhibit bacterial growth within the cartridge.

Key benefits include:

• Reduction of free chlorine

• Improved taste and odour

• Reduction of selected organic contaminants

• Additional reduction of certain heavy metals

• Bacteriostatic properties from KDF media

Stage 4 – AIPRO-1M-AQ fine sediment filter

The final cartridge uses polypropylene sediment filtration media with a nominal 5-micron rating.

It provides an additional filtration stage to capture finer suspended particles that may remain after the earlier treatment stages.

It helps reduce:

• Fine sediment

• Rust particles

• Sand

• Other suspended solids

This final mechanical filtration stage helps improve the clarity of the filtered water.

Designed for the Aquafilter EXCITO-ST system

The EXCITO-ST-CRT is designed to replace the four original inline cartridges in the Aquafilter EXCITO-ST under-sink filtration system.

The set contains:

• 1 × AIPRO-20M-AQ – 20-micron sediment cartridge

• 1 × AISTRO-L-AQ – water-softening cartridge

• 1 × AICRO-L4-AQ – activated carbon and KDF cartridge

• 1 × AIPRO-1M-AQ – 5-micron sediment cartridge

The cartridges use 1/4-inch NPT connections and are approximately 2.5 × 12 inches in size.

Key features

• Genuine Aquafilter replacement cartridge set

• Four inline replacement cartridges

• Designed for the Aquafilter EXCITO-ST system

• 20-micron first-stage sediment filtration

• Ion-exchange water-softening media

• Granular activated carbon filtration

• KDF media for additional contaminant reduction

• 5-micron final sediment filtration

• Helps reduce chlorine and selected organic contaminants

• Helps reduce water hardness and improve taste and odour

• 1/4-inch NPT connections

• Approximate cartridge dimensions: 2.5 × 12 inches

Technical specifications

Specification	Details
Brand	Aquafilter
Product model	EXCITO-ST-CRT
Product type	Replacement inline water filter cartridge set
Number of cartridges	4
Compatible system	Aquafilter EXCITO-ST
Stage 1	AIPRO-20M-AQ
Stage 2	AISTRO-L-AQ
Stage 3	AICRO-L4-AQ
Stage 4	AIPRO-1M-AQ
First-stage micron rating	20 microns
Fourth-stage micron rating	5 microns
Filtration technologies	Sediment, ion exchange, activated carbon and KDF
Cartridge dimensions	2.5 × 12 inches
Connection type	1/4-inch NPT
Replacement interval	Refer to manufacturer guidance and incoming water quality
Ultrafiltration membrane	Not included

Cartridge replacement and maintenance

Regular cartridge replacement helps maintain filtration performance and drinking water quality.

GroAqua currently lists an indicative filter life of 6–12 months for this set. Actual replacement intervals depend on incoming water quality, sediment levels, water hardness and the volume of water filtered.

Consider replacing cartridges sooner if you notice:

• Reduced water flow

• Changes in the taste or smell of filtered water

• Increased sediment in the incoming water supply

• Reduced water-softening performance

Always follow the manufacturer's installation and flushing instructions when replacing cartridges.

Important compatibility information

The EXCITO-ST-CRT is designed for the Aquafilter EXCITO-ST system and uses 1/4-inch NPT connections.

It should not be confused with the EXCITO-B-CLR-CRT replacement set, which uses different cartridges and 1/4-inch QM quick-connect fittings.

Please note: This product contains four replacement cartridges only. It does not include the EXCITO-ST filtration unit, drinking water tap or an additional ultrafiltration membrane. If your installation uses an optional TLCHF-FP ultrafiltration membrane, this must be purchased separately.