SMACO S700 Plus Mini Tank 1.9L

The SMACO S700 Plus is the most capable mini scuba tank on the consumer market — it delivers genuine underwater breathing time for boat work, hull cleaning, and shallow exploration, provided you understand exactly what it is and what it isn't.

At $729, this isn't an impulse purchase. It's a serious piece of kit aimed at boat owners, yacht maintenance crews, snorkellers who want more time below, and qualified divers who need a quick-access backup air source. In Australian waters, where boat hulls accumulate growth rapidly in warm Queensland marinas and mooring inspections are a regular chore, the S700 Plus solves a real problem. But it must be said clearly: this is not a substitute for proper scuba equipment and training, and SMACO's marketing occasionally blurs that line.

## Overview

The S700 Plus is a 1.9-litre aluminium cylinder that fills to approximately 200 bar (3000 psi), delivering 25-30 minutes of breathing time at the surface and progressively less as depth increases. At 5 metres, expect roughly 15-20 minutes. At 10 metres, you're looking at 10-15 minutes depending on breathing rate and workload.

The system includes the cylinder, an integrated first-stage regulator, a mouthpiece second stage, a pressure gauge, and a carrying harness. Fill options include a hand pump (included), a compatible electric compressor (sold separately), or filling from a standard scuba tank via an adapter. The hand pump works but it's tedious — expect 15-20 minutes of pumping to fill from empty. Most Australian users quickly invest in the electric compressor or fill from their dive shop's compressor via the adapter.

Build quality is a step above earlier SMACO models. The aluminium cylinder is DOT/CE certified, the regulator breathes smoothly at shallow depths, and the pressure gauge is legible. The integrated design means there's less to assemble and fewer failure points than modular mini tank systems. At 3.5 kg fully loaded, it's light enough to carry one-handed and compact enough to stow in a boat locker or car boot.

Compared to the Spare Air 3000 (a smaller emergency-only unit at similar cost), the S700 Plus offers dramatically more air and genuine usability beyond emergency scenarios. Against proper scuba gear, it's obviously limited — a standard 12-litre tank gives you an hour or more at recreational depths. The S700 Plus occupies the space between snorkelling and scuba: more capability than breath-holding, less capability than a full rig.

For Australian boat owners, the practical applications are clear. Hull inspections in marinas from Cairns to Hobart, propeller untangling, mooring chain checks, and quick underwater repairs all become straightforward tasks instead of requiring a full scuba setup or a commercial diver. Recreational snorkellers at places like the Whitsundays or Rottnest Island gain the ability to stay down and observe marine life without the constant need to surface for air.

## Key Features

- 1.9-litre aluminium cylinder rated to 200 bar (3000 psi) - Approximately 25-30 minutes breathing time at surface - Integrated first-stage regulator and second-stage mouthpiece - Analogue pressure gauge - Hand pump included; compatible with electric compressor and scuba tank fill adapter - DOT and CE certified cylinder - Total weight: approximately 3.5 kg filled - Maximum recommended operating depth: 10 metres - Aluminium construction resists saltwater corrosion - Carrying harness and mesh storage bag included

## The Good

- **Genuine usable breathing time for practical underwater tasks**: 25-30 minutes at the surface is enough to complete a hull inspection, clear a fouled propeller, or check mooring hardware without rushing. This is meaningfully more air than any other consumer mini tank delivers. - **Build quality has improved significantly from earlier SMACO models**: The regulator breathes easily at shallow depths, the cylinder finish resists corrosion well in saltwater environments, and the pressure gauge is accurate and readable. Earlier complaints about leaky fittings appear to have been addressed. - **Portability makes it genuinely convenient for boat use**: At 3.5 kg, you can keep one aboard permanently without it being a storage problem. It stows in a locker, sits in a milk crate, or hangs from a rail clip. Getting it in and out of the water is effortless. - **Multiple fill options provide flexibility**: Hand pump for emergencies, scuba tank adapter for dive boats, electric compressor for regular users. The adapter that fills from a standard scuba tank is particularly useful for divers who already have cylinders and compressor access. - **Useful as a bailout or backup air source for qualified divers**: On a free-diving trip or a snorkelling charter, having a mini tank accessible on the boat adds a genuine safety margin for emergencies.

## The Bad

- **$729 is a lot of money for the amount of air you get**: A full scuba setup with a proper 12-litre tank, regulator, and BCD can be assembled second-hand for similar money and delivers dramatically more capability. The S700 Plus only makes financial sense if portability and convenience are your primary requirements. - **Marketing language overpromises the diving experience**: SMACO's promotional materials sometimes imply this is a viable alternative to scuba diving. It is not. At 10 metres depth, you have 10-15 minutes of air with no buoyancy control, no redundancy, and no depth monitoring. Untrained users treating this as scuba gear is a genuine safety concern. - **Hand pump filling is impractical for regular use**: Twenty minutes of vigorous pumping to fill a tank that provides 25 minutes of breathing is a poor ratio. Budget for the electric compressor or scuba adapter if you plan to use it more than occasionally. - **No buoyancy control or depth monitoring**: There's no BCD, no depth gauge, and no computer. Managing buoyancy at even 5 metres requires skill that casual users may not have. Uncontrolled ascents from shallow depth can still cause barotrauma.

## Verdict

The SMACO S700 Plus fills a legitimate niche for Australian boat owners and water workers who need brief underwater breathing capability without the complexity of full scuba gear. For hull maintenance, mooring inspections, and shallow-water tasks, it's a practical and well-built tool that saves time and money compared to hiring a commercial diver or gearing up in full scuba kit for a five-minute job. For recreational snorkellers, it extends your time underwater meaningfully. However, at $729, it's an investment that only makes sense if you'll use it regularly, and it must be treated with the same respect as any compressed-air breathing apparatus. This is not a toy, and users without basic scuba training should restrict themselves to very shallow depths. Buy it if you maintain a boat or want a portable backup air source. Skip it if you're looking for a cheap alternative to learning to scuba dive properly.

Star Rating: ⭐⭐⭐⭐☆ (4/5)