Trevoli Big Blue 10 Inch Single Filter Housing - Option 1, Rainwater & Tank Water NZ

Simple, effective sediment removal for rainwater and tank water. This single 10 inch jumbo filter housing comes pre-fitted with a Pentair Dual Gradient 25-1 filter — a single cartridge that does the work of two sediment stages, filtering at 25 micron on the outer layer and progressively finer toward the centre, finishing at 1 micron.

Suited to baches, granny flats, minor dwellings, and smaller homes on tank water where a compact single-housing setup is all that's needed.

Housing arrives assembled with spanner and standard bracket. Select your bracket or stand option and pressure gauge from the dropdowns.

Key specs at a glance

• Housing size: 10 inch jumbo (single)
• Inlet/outlet: 25mm (1" BSP)
• Filter: Pentair Dual Gradient 25-1 — 25 to 1 micron dual gradient sediment
• Maximum operating pressure: 125 PSI
• Material: Food-grade, quality brass lined ports
• Pressure relief button: Yes (air bleeder)
• Comes assembled with spanner and bracket
• Warranty: 2 years (housing)

Configure your set

Bracket/stand (select from dropdown):

• Standard powder-coated 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)

About the Dual Gradient filter

The Pentair Dual Gradient 25-1 is a single cartridge that does the work of two sediment stages. It filters at 25 micron on the outer layer and progressively finer toward the centre, finishing at 1 micron. Coarser particles are caught in the outer layer, finer particles deeper in — this depth-loading design means the cartridge holds more sediment before restricting flow.

For a single-housing setup, the Dual Gradient delivers thorough sediment removal without needing a second housing.

Why choose this system

• Single housing, dual-stage filtration — the Dual Gradient does the work of two cartridges in one
• Compact setup — one housing, one cartridge, one connection
• Suited to tank and rainwater sediment removal — removes silt, sand, rust, and fine particles
• Quality brass lined 1 inch inlet and outlet — durable and corrosion-resistant
• Powder-coated bracket included — optional stainless steel upgrade or freestanding stand
• Optional pressure gauge — monitor filter life without guessing
• 2-year warranty on housing

Technical specifications

What's in the box

• 1x Big Blue 10 inch jumbo filter housing
• 1x Pentair Dual Gradient 25-1 filter
• Housing spanner
• Standard powder-coated bracket (unless upgrade selected)
• Pressure gauge (if selected)
• Stainless steel bracket or stand (if selected)

Frequently asked questions

What is the Dual Gradient 25-1?

It's a Pentair dual gradient sediment cartridge — one filter that transitions from 25 micron on the outside to 1 micron toward the centre. Coarser particles are caught in the outer layer, finer particles deeper in, combining two stages of sediment filtration in a single cartridge. It's the correct specification for this single-housing setup.

Is this suitable for mains water?

This system is designed for sediment removal from tank and rainwater supplies. 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 filter?

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

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

The standard and stainless steel brackets mount the housing 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 filter — when pressure drops noticeably it's a reliable sign the cartridge needs 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 housing 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.

What warranty does it come with?

2 years on the housing. Filter cartridges are consumables and don't carry a standard product warranty.