The Complete Buyers Guide To Caravan Water Filters

The water you put in your caravan tanks on the Big Lap will come from a staggering variety of sources. Town water in capital cities is reliably clean. Town water in small regional centres is usually fine but can taste of chlorine or bore minerals. Water from station tanks, outback bores, and remote fill points ranges from perfectly drinkable to genuinely questionable. A water filter sits between the source and your glass, and the right filter for your travel style is the difference between confident hydration and constant worry.

This guide covers what water filters are available for caravans, what they actually remove, and which one you should buy based on where you’re planning to travel.

What Water Filters Actually Do

Not all filters are created equal, and understanding what they remove (and what they don’t) is important before you spend money.

Sediment filters remove particles: dirt, sand, rust, and debris. They improve clarity and prevent grit in your water but don’t address taste, chemicals, or bacteria. These are the most basic filters and are often the first stage in multi-stage systems. Filtration is typically rated in microns: a 5-micron filter catches most visible sediment, a 1-micron filter catches finer particles.

Carbon filters remove chlorine, bad taste, odours, and some organic chemicals through adsorption. They’re what make bore water and heavily chlorinated town water taste clean. Carbon is the most common filter media in caravan filters and is effective for the majority of Australian water sources. Carbon filters don’t remove bacteria or viruses.

Ceramic filters have microscopic pores (typically 0.2 to 0.5 microns) that physically block bacteria, cysts, and protozoa while also reducing sediment. They’re effective against biological contamination and can be cleaned and reused multiple times before replacement. They don’t remove chemicals or chlorine on their own, so they’re often combined with carbon.

UV treatment kills bacteria and viruses by exposing water to ultraviolet light. It’s effective against biological contamination but doesn’t remove sediment, chemicals, or improve taste. UV units require power (12V or battery-operated) and are typically used as a final stage after sediment and carbon filtration.

Reverse osmosis (RO) pushes water through a semi-permeable membrane that removes virtually everything: sediment, chemicals, heavy metals, bacteria, and minerals. RO produces extremely clean water but is slow, wastes water (typically 3 to 4 litres of waste per litre of filtered water), and removes beneficial minerals. Overkill for most caravan use.

Types of Caravan Water Filters

Inline Filters (External)

These connect between your hose and the tank inlet, filtering water as you fill. They’re the simplest and most common caravan filter setup. You screw the filter onto your hose, connect it to the tap, and water passes through the filter before entering your tank. Most are single-stage (carbon or carbon/sediment combination) and cost $30 to $80 for the housing plus replacement cartridges.

Pros: Cheap, simple, no installation required, filters all water going into your tanks.

Cons: Slows fill rate (particularly fine-micron filters), cartridges need regular replacement, doesn’t address contamination already in your tanks.

Under-Sink Filters (Internal)

Permanently installed under the kitchen sink, these filter water at the point of use. Water from your tanks passes through the filter before reaching the tap. They can be single-stage or multi-stage (sediment + carbon + ceramic is a common combination). Installation requires basic plumbing skills or a caravan technician. $80 to $350 for the system plus ongoing cartridge costs.

Pros: Filters water at the point of use (addresses tank contamination), multi-stage options available, doesn’t slow tank filling.

Cons: Requires installation, takes up space under the sink, cartridge replacement costs add up.

Whole-of-Van Systems

Premium systems that filter all water in the van, including the shower and bathroom sink. These are typically multi-stage with larger-capacity cartridges and are plumbed into the main water line after the pump. $200 to $600 for the system. The advantage is comprehensive filtration; the downside is cost and complexity.

Portable Gravity Filters

Standalone filter systems (like the Doulton or similar gravity-fed ceramic filters) that sit on the bench and filter water by gravity. You pour water in the top, it passes through a ceramic filter element, and clean water collects in the bottom chamber. These are particularly popular with travellers who fill from variable sources, as the ceramic elements can handle more contaminated water than inline carbon filters.

Pros: No installation, portable, ceramic elements handle biological contamination, easy to clean.

Cons: Slow (gravity-fed), takes up bench space, only filters drinking water (not the whole system).

Product Recommendations

Camec Inline Water Filter

A basic inline carbon filter that connects to your fill hose. Removes chlorine, sediment, and bad taste from treated town water. Filter cartridge lasts approximately 10,000 to 15,000 litres depending on water quality. The most popular entry-level caravan water filter in Australia for good reason: it’s cheap, effective for what it does, and requires zero installation. Around $35 to $50 for the housing and initial cartridge, $15 to $25 for replacement cartridges.

Puretec Caravan Inline Filter

A step up from the Camec with a higher-quality carbon block cartridge rated to 0.5 microns (compared to the Camec’s 5-micron rating). This finer filtration catches more sediment and provides better taste improvement. The housing is more robust with better fittings. Around $60 to $80 for the system. Replacement cartridges around $25 to $35.

Caravan RV Camping Twin Under-Sink System

A twin-cartridge under-sink system with a sediment pre-filter and carbon block main filter. Provides comprehensive filtration at the kitchen tap and installs in about an hour with basic plumbing skills. Good value for a multi-stage setup. Around $120 to $160 for the system, $30 to $50 for replacement cartridge sets.

Doulton Gravity-Fed Ceramic Filter

A portable gravity-fed filter with ceramic filter candles that remove bacteria, cysts, and sediment down to 0.2 microns. The ceramic elements can be scrubbed clean and reused for up to 12 months before replacement. Ideal for travellers who fill from bores, tanks, and non-treated sources in remote areas. The filter sits on the bench and filters water slowly by gravity (roughly 1 to 2 litres per hour). Around $120 to $180 for the system, $40 to $60 for replacement candles.

Cleansui Under-Sink System

A premium Japanese-made system using hollow-fibre membrane technology that removes bacteria, cysts, chlorine, and chemicals in a single cartridge. Compact, high flow rate, and highly effective. The downside is cartridge cost. Around $180 to $250 for the system, $60 to $80 per cartridge (replaced every 6 to 12 months).

Which Filter Should You Buy?

If you’re mainly filling from town water at caravan parks and regional centres: A basic inline carbon filter like the Camec or Puretec is all you need. It removes chlorine taste and sediment, which are the main issues with treated Australian water. $35 to $80.

If you’re free camping regularly and filling from a mix of sources: An under-sink system gives you multi-stage filtration at the point of use, covering both treated and mildly variable water. The CRC Twin or similar system is the sweet spot. $120 to $180.

If you’re heading remote and filling from bores, tanks, and non-treated sources: You need biological filtration. Either a ceramic gravity filter (like the Doulton) for portable standalone use, or a premium under-sink system with hollow-fibre or ceramic elements. Consider adding a UV treatment stage if you’re genuinely concerned about water quality. $120 to $300+.

If in doubt: Start with an inline carbon filter. It handles the vast majority of water you’ll encounter on the Big Lap, costs almost nothing, and you can upgrade to a more comprehensive system if your travels take you to areas with questionable water.