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Neptune replacement filter set — 5-1-1 micron, three-stage
Neptune 20" System Filters

Replacement
Filter Set

Maintains performance and warranty compliance for your Neptune whole-home system. Designed for 20" housings with 5–1–1 micron filtration.

$299.95
Includes all 3 filters — pleated sediment (5 micron), scale reduction carbon block (1 micron), coconut carbon block (1 micron)
Free delivery to your door · Standard delivery: 2–4 business days
Quantity
1
Total: $299.95
Replace every 12 months to maintain performance and warranty
We send reminders at 9, 11, and 12 months.
Secure payment: VISA MC AMEX PayPal AfterPay
What's included
Pleated sediment filter (5 micron) — removes rust, dirt, and sediment
Scale reduction carbon block filter (1 micron) — reduces chlorine, taste, odour, and scale buildup
Coconut carbon block filter (1 micron) — removes pesticides, herbicides, VOCs, and helps reduce heavy metals such as lead and mercury
Free delivery to your door
Specifications
Compatible systemNeptune 20" Whole Home
Filtration stages3-stage (5–1–1 micron)
Replacement intervalEvery 12 months
Housing size20" standard
CertificationWaterMark · AS 3497
Filter typeSediment, Carbon Block, Coconut Carbon Block
WarrantyCovered under 7-yr workmanship
Simple 5-minute replacement

No plumber required. The filter set is designed for straightforward DIY replacement using your existing Neptune removal tool.

1
Turn off the mains water supply at your Neptune shut-off valve
2
Use your Neptune removal tool to unscrew each filter housing
3
Remove old filters, rinse housings, and insert new filters
4
Tighten housings securely and restore mains water supply
5
Run water briefly to flush the system — done

Verified customer reviews will appear here as Neptune customers share their experiences.

If you have questions about the replacement filter process, call us on 03 9122 5243 or email office@neptunefiltration.com.au.

Why it matters

Replace annually. Stay protected.

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Maintains performance
Saturated filters stop working. Replacing annually keeps every tap, shower, and appliance running on clean water.
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Protects your warranty
Annual replacement is required to maintain your 7-year workmanship warranty. Keep your system covered.
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Set and forget
We send reminders at 9, 11, and 12 months — so you never miss a replacement or risk your warranty.