The visible basin of a pedicure spa is the smallest part of the cleaning problem. What matters is the piping behind the jets, and state sanitation rules are written around that fact.
Why jetted basins are harder to clean
A whirlpool basin circulates water through an intake, a pump and a return jet. That circuit is enclosed and cannot be reached with a cloth or seen by anyone.
Skin cells, oils, lotion residue and hair are drawn into the intake during a service. Warm, still water in the pipes afterward is an environment where organisms multiply.
Biofilm forms on the inner surfaces, a layer of organisms bound in a matrix that resists disinfectant far more effectively than free-floating organisms do.
What the required procedure looks like
Between clients, the basin is drained, visible debris and the screen or filter are removed, surfaces are scrubbed with detergent, and the basin is refilled with disinfectant.
The disinfectant must then circulate through the jets for the contact time stated on its label. Running it briefly does not achieve what the label describes.
End-of-day and weekly procedures add deeper cleaning of the removable parts and a longer circulation period, often with the basin left filled overnight.
Why record-keeping is part of the rule
Because the process is invisible once complete, states commonly require a written cleaning log recording the date, time, procedure and the person who performed it.
Inspectors cannot verify a past cleaning by looking at a clean basin. The log is the only evidence, which makes it a routine focus of inspections.
Missing or retroactively completed logs are a common citation, and in many states they carry consequences independent of whether contamination is found.
How pipeless designs changed the calculation
Pipeless foot spas replace the circulation loop with a magnetically driven impeller sitting in the basin itself, with no plumbing behind it.
Every wetted part can be removed and disinfected as an ordinary non-porous implement, which eliminates the inaccessible surfaces that create the underlying problem.
Simple basins with no jets at all are the least complex option, and many salons have moved toward them or toward disposable liners for the same reason.
What raises risk on the client's side
Shaving legs shortly before a pedicure creates small breaks in the skin, and licensed technicians commonly ask clients to avoid it in the preceding day.
Existing cuts, insect bites, cracked heels or any open area provide the same route, and a technician is generally required to decline service over broken skin.
Redness, warmth, swelling or nodules developing on the lower legs in the days after a pedicure is a matter for a physician, and prompt evaluation is what matters.