Lawrence Quarles

Why this site exists

Commercial water buyers are stuck between two bad options. On one side: corporate manufacturer marketing pages that overpromise and underspecify. On the other: aggregator sites run by marketers who don't know the difference between a Grade III plant and a Grade IV plant. There's no independent resource written by someone who has actually operated these systems professionally.

Commercial Water Lab fills that gap. Every review and buying guide on this site is written by a credentialed operator with hands-on experience across industrial, vendor, and municipal water treatment. When I recommend a system, it's because I understand how it actually performs in operation — not because of a press release or a marketing brief.

The audience I'm writing for: facilities engineers, plant managers, operations directors, restaurant owners, hotel maintenance staff, and the small-to-mid-sized businesses making real commercial water purchase decisions. The goal is to give you the same quality of technical evaluation that a large enterprise would get from a consulting firm — without the consulting fees.

Career background

I've spent the last 18 years working in wastewater and industrial water treatment. The path covered three distinct vantage points — long-tenure operations at a major refinery, vendor-side build/O&M at customer sites, and current municipal Grade IV operations — plus industrial chemistry and manufacturing roles that round out the technical picture.

• Mar 2024 – Present
  Water Pollution Control Operator IV
  City of Huntsville, Alabama

  Currently operating as a Grade IV operator at the City of Huntsville's wastewater treatment facility. Huntsville uses the legacy "water pollution control" department naming, but the work is wastewater treatment under ADEM Grade IV certification — process control decisions on biological treatment, regulatory compliance, and facility operations. Active operator status means current technical knowledge, ongoing continuing education requirements, and accountability under Alabama's regulatory framework.

• Mar 2023 – Feb 2024
  Chemical Technician
  GE Aerospace · Madison, Alabama

  Industrial chemistry and process operations work at GE Aerospace's Madison facility. Aerospace manufacturing involves precise chemical processes, water quality control for industrial applications, and the kind of regulatory rigor that translates directly to commercial water treatment.

• May 2022 – Mar 2023
  Production Operator
  3M · Decatur, Alabama

  Manufacturing operations at 3M's Decatur facility. The role added direct exposure to manufacturing-scale water management and the operational realities of large industrial facilities, complementing the wastewater operations background.

• Nov 2020 – May 2022
  Wastewater Operator (Hydroxide Precipitation System)
  Veolia Water Technologies · Huntsville, Alabama

  1.5 years operating a Veolia-contracted hydroxide precipitation wastewater system at an industrial manufacturing customer in Huntsville. Hydroxide precipitation is a specialized treatment process for heavy metals removal — common in metal finishing, electroplating, and surface treatment processes that generate metal-bearing wastewater. Operating contracted-service plants meant taking direct accountability for the customer's compliance and process performance — a different operational dynamic than running an in-house facility.

• Oct 2018 – Dec 2019
  Field Service Technician
  Evoqua Water Technologies (now Xylem)

  Vendor-side contract operations with Evoqua, one of the largest commercial and industrial water treatment equipment manufacturers in North America (acquired by Xylem in 2023). The role was assigned to large industrial customer sites — including a major Alabama electric utility as the primary assignment, and a backup role operating a reverse osmosis system at a titanium dioxide manufacturing facility in Mississippi. The work covered the full lifecycle of customer water systems: helping build new sites, operating systems through commissioning, and providing ongoing maintenance. Vendor-side contract work teaches you how systems are specified and sold, but more importantly exposes the gap between what's promised in proposals and what actually happens during operation.

• Oct 2004 – Oct 2018
  Wastewater Operator (Activated Sludge)
  Hunt Refining Company · Tuscaloosa, Alabama

  14 years operating the activated sludge wastewater treatment plant at Hunt Refining Company's Tuscaloosa refinery — one of the largest petroleum refineries in the southeastern U.S., processing approximately 90,000 barrels per day across the Tuscaloosa and Sandersville facilities. The plant treats process water from the refinery's operating units. Refinery wastewater is one of the most demanding environments in the field — hydrocarbons, sulfur compounds, complex chemistry, and strict regulatory compliance under EPA and ADEM oversight. The 14-year tenure built deep practical understanding of pretreatment, biological treatment, separation processes, and the operational tradeoffs that determine whether a treatment plant actually works in the real world.

• 1998 – 2001
  United States Navy
  Sasebo, Japan · Electrician's Mate & Deck Seaman

  Three years of active duty Navy service in Sasebo, Japan. Naval service provided foundational technical training in shipboard electrical systems, equipment operation, and the disciplined approach to maintenance and operations that translates directly to industrial facility work.

Credentials

Operator certifications matter in this industry because they're the legal authority to make process control decisions on water and wastewater treatment systems. Grade IV is the highest level in Alabama — the certification required to operate the largest and most complex municipal facilities.

What Grade IV means

Alabama's wastewater operator certification system runs from Grade I (entry level) to Grade IV (highest). Grade IV operators are legally authorized to make process control decisions at activated sludge plants over 5 MGD or trickling filter plants over 15 MGD — the largest and most complex municipal treatment facilities. Certification requires demonstrated experience at Grade III or IV facilities and successful completion of a state examination administered by ADEM.

Process control decisions at certified facilities can only be made or supervised by a properly certified operator. The certification carries legal accountability: Grade IV operators are often the Operator Responsible in Charge (ORC) for treatment facilities, with full responsibility for plant performance, regulatory compliance, and operational safety.

What independent means here

What you can expect from this site

• Technical depth: Reviews include actual specs, performance data, and operational considerations — not just feature bullet points.
• Honest tradeoffs: Every system has weaknesses. Our reviews call out what each system does poorly, not just what it does well.
• Industry context: Recommendations consider the realities of commercial operations — duty cycles, maintenance access, regulatory compliance, total cost of ownership.
• Updated regularly: Pricing, specs, and product availability change. Pages get updated when the underlying information changes.
• Specific use case fit: The right system for a 50-seat coffee shop is not the right system for a 500-seat hotel. Recommendations are framed by use case, not by generic "best of" rankings.

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