Pool Opening & Closing Checklist Generator

This is a fill-in seasonal SOP, not a calculator — there is no dosing math and no computed result. Pick Closing (winterize) or Opening and the whole step list regenerates: closing builds the winterize sequence (balance → clean → winter chemicals → lower water → drain → blow lines → antifreeze → plugs → cover → store); opening builds the spring start-up sequence (remove cover → reinstall → prime → top up → inspect → clean → test & balance → backwash → note repairs).

Inground keeps the line blow-out and antifreeze steps and covers with water bags filled 50–67% for ice expansion; above-ground drops those two steps and swaps the cover step to a cable & winch with an air pillow. Salt adds a salinity row to the pre-work targets; the rest of the bands are the same.

The pre-work targets (pH, total alkalinity, calcium hardness, free chlorine, plus CYA on opening and salinity on salt pools) ship as typical, editable defaults — edit any cell to your pool. They are a starting reference, not a compliance standard; follow the product label. Closing brings free chlorine to a shock level per the label before covering — not a computed dose.

The chemical-kit rows are free text and are never deducted from inventory. If you add a unit price, the sheet shows an optional estimated materials cost (this job) — a stateless display courtesy, never an invoice. Nothing you enter is saved; the signature line is a record of work performed, not a warranty, contract, or compliance record.