How Do You Compare Ozone Quotes That Look Nothing Alike?

Three proposals land within a fortnight of each other. One runs four pages, one runs fourteen, and the prices are nowhere near each other. The instinct is to assume someone is overcharging. Usually nobody is.

Ozone proposals vary because suppliers make different assumptions about what you already have and what you want them to supply. Until those assumptions are lined up, the prices are not comparable in any meaningful way. This article sets out how to normalize an ozone system quote onto a common basis. It also covers what tends to be quietly missing from the shortest one, and how to read total cost over the life of the equipment. Growers working through ozone systems for greenhouse water treatment hit this problem almost every time.

Why Do Two Quotes for the Same Job Differ So Much?

The most common reason is headline output stated on different terms. Generator capacity gets quoted in grams per hour. That figure depends entirely on the ozone concentration and feed gas it was measured at. A unit rated at one concentration produces a different number at another. Comparing two output figures without checking their basis is like comparing two speeds without checking the units.

Scope is the second reason. An ozone system is not only a generator. Injection, a contact vessel, off-gas destruction, instrumentation, and control all have to exist somewhere. One supplier bundles them. Another assumes you are supplying the contact vessel yourself. Both approaches are legitimate, and the resulting prices are not remotely comparable.

What Is Usually Missing From the Cheapest Proposal?

Instrumentation deserves particular attention, because it is the easiest item to defer and the most expensive to add later. A system without continuous measurement runs blind. You know the generator is powered, but you do not know what the water is doing. Adding ORP control for ozone dosing after commissioning usually costs more than specifying it at the start.

Commissioning is the other frequent omission. Equipment delivered to a pad is not a working system. Someone has to set injection, calibrate against your actual water, and verify performance under real flow. Where that work is excluded, it becomes your cost or your problem, and it rarely appears in the comparison spreadsheet.

How Do You Normalize Proposals Onto One Basis?

Rebuild every ozone system quote onto a single line-item template before looking at totals. Checking each one against the published ozone system specifications is a fast first filter. The table below covers the items that most often differ. Ask each supplier to confirm their position on every row, in writing.

That last row hides more variance than any other. Equipment life varies widely between manufacturers. Higher-end systems last for many years, whereas cheaper overseas units often fail within months. Ask each supplier for the expected service life of the generator and its key components, not just the price on the first page.

What Does Cost Look Like Over Five Years?

Build quality drives the long-term number more than any single line item. A generator that needs major repairs in year two, or full replacement in year three, erases whatever it saved at purchase. Downtime adds its own cost, because water keeps flowing to the crop while the system waits for parts. Before signing, ask how long the core components are designed to last and what the typical service interval looks like. Also ask how many units of that model are still running after five or more years in a comparable operation. Those answers say more about the true cost of an ozone system quote than the total at the bottom of the page. The broader case is covered in the operating advantages of ozone water treatment.

Where Do Buyers Get the Comparison Wrong?

The most frequent error is treating an ozone system quote as a price list rather than a scope document. An ozone system quote describes a boundary as much as a price. Price differences are usually a symptom. Scope differences are the cause.

A second error involves expectations about what the system protects. Ozone breaks down quickly and holds no lasting residual through a distribution system. It disinfects water at the point of treatment and lowers overall microbial load, which can reduce downstream problems indirectly. Buyers who expect residual protection sometimes over-specify the generator to compensate, when the gap actually sits in line maintenance. The underlying behaviour is explained in the chemistry of ozone in water treatment.

A third mistake is comparing equipment while ignoring what happens after handover. Response times, parts availability, and commissioning depth vary as much as the hardware does. Those terms belong in the comparison alongside price, not in a conversation after the order is placed. That is why Purifico sets out its ozone system commissioning and support commitments up front. We do whatever it takes to make our clients successful, and every system we sell is the start of a long-term relationship.

What Should a Complete Proposal Contain?

Use this as a checklist when an ozone system quote arrives. Anything absent is a question, not necessarily a problem.

• Output stated with its measurement concentration and feed gas, not a bare figure
• The peak flow and water analysis the sizing was built against
• Every component in the treatment train listed, including contact and off-gas handling
• A clear boundary showing where their scope ends and yours begins

One addition is worth requesting even when it is not offered. Ask for the supplier’s assumed operating hours and water quality in writing. Those two inputs drive nearly every recurring figure in the proposal. Stating them turns an ozone system quote into something you can audit later. Systems with logging, such as the ZONE remote monitoring platform, let you check those assumptions against reality once the equipment is running.

Frequently Asked Questions

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