Trevoli Big Blue 20 Inch Twin Filter Housing - Option 5, Rainwater & Tank Water NZ

$371.00 NZD

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Two-stage sediment filtration for rainwater and tank water — in a high-capacity 20 inch jumbo format. This twin 20 inch jumbo filter housing set comes pre-fitted with a 20 micron polypleated first stage and a 1 micron polyspun second stage, covering coarse sediment through to fine particles at a maximum flow rate of 150 LPM.

Suited to medium to large homes on tank or rainwater supply. The 20 inch format delivers greater filter capacity and longer cartridge life than a 10 inch set. The 1 micron second stage physically blocks Giardia cysts, which are common in unprotected rainwater and surface water supplies.

Housing arrives assembled with threaded nipple, integrated mounting bracket, and spanner. Select your bracket or stand option and pressure gauge from the dropdowns.

Key specs at a glance

Housing size: 20 inch jumbo (twin set)
Inlet/outlet: 25mm (1" BSP), brass lined
Stage 1: 20PL20 — 20 micron polypleated sediment (cleanable and reusable)
Stage 2: 20PP01 — 1 micron polyspun sediment
Maximum operating pressure: 125 PSI
Maximum flow rate: 150 LPM
Material: Food-grade, quality brass lined ports
Pressure relief button: Yes (air bleeder on each housing)
Includes threaded nipple to join housings
Comes assembled with spanner and integrated bracket
Warranty: 2 years (housing)

Configure your set

Bracket/stand (select from dropdown):

Standard integrated mounting bracket (included)
Stainless steel bracket (upgrade)
Stand (upgrade) — freestanding combined stand and bracket unit

Pressure gauge (select from dropdown):

No pressure gauge
Pressure gauge (add-on)

What's included

Stage 1 — 20PL20, 20 micron polypleated sediment

Catches coarse debris, silt, sand, and larger particles from tank water. The pleated design provides a large surface area for high dirt-holding capacity. The 20 inch format holds more sediment than a 10 inch cartridge, reducing the frequency of changes. Cleanable and reusable — rinse between replacements to extend its life.

Stage 2 — 20PP01, 1 micron polyspun sediment

Fine sediment filtration at 1 micron. Removes fine silt, clay particles, and other small suspended matter. At 1 micron, the filter physically blocks Giardia cysts — common in unprotected rainwater and surface water supplies. The 20 inch format provides greater capacity than a 10 inch cartridge. Not reusable — replace when flow drops.

Replace both cartridges every 6–12 months depending on your water quality and usage. In high-sediment water the Stage 1 pleated filter can be rinsed between replacements to extend its life.

Why choose this system

Two-stage sediment filtration — 20 micron coarse stage followed by 1 micron fine stage
20 inch jumbo format — greater filter capacity and longer cartridge life than Option 2
Maximum flow rate of 150 LPM — suited to medium to large homes with higher demand
1 micron rating physically blocks Giardia cysts
Stage 1 is cleanable and reusable — rinse and reinstall to extend time between replacements
Threaded nipple included to join housings
Quality brass lined 1 inch inlet and outlet — durable and corrosion-resistant
Integrated mounting bracket included — optional stainless steel upgrade or freestanding stand
Optional pressure gauge — monitor filter life without guessing
2-year warranty on housing

Technical specifications

Model	BB-OPT5
Housing size	20 inch jumbo
Cartridge size	20" x 4.5"
Inlet/outlet	25mm (1" BSP), brass lined
Stage 1	20PL20 — 20 micron polypleated sediment (cleanable)
Stage 2	20PP01 — 1 micron polyspun sediment
Maximum operating pressure	125 PSI
Maximum flow rate	150 LPM
Mounting	Integrated bracket (included) / Stainless steel bracket / Stand (upgrades)
Includes	Threaded nipple (to join housings)
Assembly	Pre-assembled with spanner
Warranty	2 years (housing)

What's in the box

2x Big Blue 20 inch jumbo filter housings (pre-mounted)
1x 20PL20 — 20 micron polypleated sediment filter
1x 20PP01 — 1 micron polyspun sediment filter
1x Threaded nipple (to join housings)
Housing spanner
Integrated mounting bracket (unless upgrade selected)
Pressure gauge (if selected)
Stainless steel bracket or stand (if selected)

Frequently asked questions

What is the difference between Option 2 and Option 5?

Both use the same two-stage filter configuration — 20 micron pleated and 1 micron polyspun. The difference is housing size. Option 2 uses 10 inch jumbo housings; Option 5 uses 20 inch jumbo housings with a maximum flow rate of 150 LPM. The 20 inch format holds more filter media, giving longer cartridge life and better performance at higher flow rates. Option 5 is the better choice for medium to large homes or properties with higher daily water demand.

Does the 1 micron filter remove Giardia?

At 1 micron, the polyspun filter physically blocks Giardia cysts, which are typically 8–12 microns in size. This is a physical size exclusion — the cysts are too large to pass through the filter media. For complete protection against all waterborne pathogens, a UV treatment stage is recommended in addition to filtration.

Can I clean the Stage 1 filter?

Yes — the 20 micron polypleated cartridge is cleanable and reusable. Rinse under a tap when flow drops, and reinstall. Replace when it no longer recovers after cleaning or when it's visibly damaged.

Is this suitable for mains water?

This system is configured for rainwater and tank water sediment removal. For mains water, the priority is typically chlorine and taste reduction — get in touch and we'll point you to the right option.

When do I replace the filters?

Every 6–12 months depending on your water quality and usage. In high-sediment water — common after heavy rain or in summer — you may need to replace more frequently. The clearest sign is a drop in water pressure or flow rate.

What's the difference between the bracket and stand options?

The standard and stainless steel brackets mount the housings to a wall. The stand is a freestanding combined stand and bracket unit — it doesn't require wall mounting, which suits installations where wall mounting isn't practical.

Should I add a pressure gauge?

A pressure gauge lets you monitor the pressure drop across the filters — when pressure drops noticeably it's a reliable sign the cartridges need replacing. Useful if you want to track filter life without guessing.

Do I need a plumber to install it?

For most customers, yes — a licensed plumber is the safest path. The set uses standard 25mm BSP fittings and arrives assembled with a housing spanner. If you're confident with household plumbing, the installation is straightforward. Get in touch if you're unsure.