The wider panel — for deeper questions and older systems.

When the Essential questions are answered and the harder ones remain. The Advanced panel casts a wider net across metals, minerals and additional compounds, for homes where the basics raised a flag, where the plumbing or the well is old, where there is farmland, industry or heavy road treatment nearby, or where a symptom — taste, odour, staining, stomach trouble — has no explanation yet.

Early discovery, wider net. Many water problems are patterns, not single numbers: a cluster of results tells you whether you are looking at geology, corrosion inside the house, or something arriving from outside. A wider panel taken early can end months of guessing, protect appliances and water heaters from silent scale and corrosion damage, and size any treatment correctly the first time — treatment bought without data is the most expensive kind.

What you get:

• Everything in the Essential panel's approach, across a substantially wider analyte set (exact list confirmed on your report)
• Certified-laboratory analysis with reporting limits stated for every result
• Tandem's plain-language read of the pattern — source likely inside the home, at the well, or in the ground
• A written treatment path if one is needed — what to install, in what order, and what it should cost

Best for: pre-purchase due diligence on older properties, unexplained symptoms, homes near agriculture or industry, and owners planning treatment who want it sized on data. Not for: PFAS-specific questions (dedicated panel below) or a quick bacteria-only check.