The quick answer
Chemical-only service focuses on testing and adjustments. Full service adds physical cleaning. The lower-cost option only works when someone reliably handles omitted tasks.
What chemical-only means
The provider tests water and adds routine products under the plan. Ask whether salt, stabilizer, specialty treatment or excessive demand is extra.
What full service adds
Skimming, brushing and basket care reduce debris and organic load, disrupt algae and give the technician more chances to notice poor flow.
Who does remaining work
With chemical-only care, the owner normally brushes, skims, empties baskets and monitors the cleaner. Chemistry alone cannot replace cleaning.
Compare price correctly
A lower rate is not a bargain if it excludes work you will not perform. Compare task lists, chemical policies and visit frequency.
Choosing a plan
Chemical-only service can fit hands-on owners who want testing help. Full service fits owners who want less physical work and one weekly routine.