Chemical vs flush portable toilets — which type do I need?

Chemical portable toilets

Chemical portable toilets are the standard type most people picture when they think of a portable loo. They use a chemical solution in the holding tank to break down waste and neutralise odours. They don't require a water connection — the tank is filled when delivered and replaced or emptied during servicing.

Best for: Construction sites, small events, rural locations, short-term hire, any situation where there's no water supply available.

Pros: Completely self-contained, no water connection needed, most affordable option, widely available across the UK, can be positioned anywhere with vehicle access.

Cons: Not as comfortable as flush units, require regular servicing to stay hygienic, not appropriate for high-end events.

Flush portable toilets

Flush portable toilets work more like a conventional toilet — they have a proper flush mechanism and a separate holding tank for waste. The better units have their own fresh water tank so they're still self-contained, while others require connection to a water supply.

Best for: Events with higher guest expectations, welfare units, longer term hires, any situation where user comfort and experience matters.

Pros: Much better user experience, feel more like conventional facilities, better for longer term use, improved hygiene.

Cons: More expensive than chemical units, self-contained versions still require regular waste emptying, mains-connected versions require access to water supply.

Luxury toilet trailers — the third option

For events where quality really matters — weddings, corporate events, high-end festivals — luxury toilet trailers are in a different category entirely. These are proper bathroom suites in a trailer format, with full flush toilets, running hot and cold water, vanity mirrors and high-quality interior finishes. They use self-contained water and waste systems and require no mains connection.

Quick decision guide

Not sure which is right for you? Just tell us about your requirement and we'll recommend the best type of unit for your situation — free of charge.