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.

Single Inline Filters

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. The single canister design makes them quick to connect and completely portable.

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

Cons: Slows fill rate (particularly fine-micron filters), cartridges block up relatively quickly, single-stage filtration only.

Twin Canister Filters

The upgrade from single inline filters. Twin canisters provide two separate filter stages, typically a sediment pre-filter followed by a carbon/taste filter. The most common setup is a 5-micron sediment filter paired with a 0.5-micron carbon filter. These are often permanently mounted on the rear bar or bumper rather than connecting and disconnecting each time.

Pros: Longer filter life, better filtration, sediment pre-filter protects main filter, can handle dirtier water sources.

Cons: More expensive, requires mounting, bulkier than single filters, slower flow rate than mesh pre-filters.

Under-Bench Systems

Permanently installed under the kitchen sink, these filter water at the point of use rather than during filling. Water from your tanks passes through the filter before reaching the tap. This addresses any contamination that may develop in your tanks during storage and provides the cleanest drinking water.

Pros: Filters water at point of use, addresses tank contamination, doesn’t slow filling, often multi-stage.

Cons: Requires installation, takes up cupboard space, ongoing cartridge costs, only filters one tap.

Pre-Filters & UV Systems

Washable Mesh Pre-Filters

An alternative approach used by some experienced travellers. Instead of fine inline filters that slow flow and block quickly, they use a 75-micron washable mesh filter to catch large debris. The internal under-bench filter then handles fine filtration and taste. This gives much faster tank filling while still protecting your system.

UV Disinfection

UV systems kill 99.9% of bacteria and viruses but don’t remove sediment or improve taste. They’re best used as an add-on to standard filtration rather than a replacement. Useful for travellers genuinely concerned about biological contamination from remote sources.

Which Filter Should You Buy?

If you’re mainly filling from town water at caravan parks and regional centres: A B.E.S.T. Inline Filter ~$45 is all you need. It removes chlorine taste and sediment, which are the main issues with treated Australian water.

If you’re free camping regularly and filling from mixed sources: Either upgrade to a twin canister system for better inline filtration, or stick with a single inline filter and add a Thirsty Nomad under-bench system ~$150 for your drinking water. The double-filter approach is the most popular setup among experienced Big Lappers.

If you want the fastest possible filling: Consider a 75-micron mesh pre-filter ~$15 for filling combined with quality under-bench filtration for drinking water. This gives you speed and quality.

If you’re heading to remote areas with questionable water: Start with a twin canister system and consider adding UV disinfection if you’re genuinely concerned about biological contamination. Never rely on filtration alone for visibly dirty or untreated water.

If in doubt: Start with a B.E.S.T. or WOMO inline 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 based on your actual travel patterns.