Algae cleanup works best when you treat it like a small recovery plan: confirm the problem, brush aggressively, support circulation, use a measured sanitizer plan, and keep following up until the pool actually holds.
Confirm what kind of cleanup you are facing
A little green dust, a slippery step, and a fully opaque pool are not the same level of problem. Your first job is to be honest about the severity so you do not under-react or panic-dose.
If the pool is dark, heavily coated, or obviously beyond what you can brush and filter through in a day or two, that is already a good moment to price out professional cleanup.
Pair sanitizer with physical cleanup
Brush first, keep the filter moving, clear baskets, and clean the filter when pressure says it is time. Sanitizer does not replace physical cleanup. It works with it.
Visible algae means the pool is already spending chlorine fast. That is why a shock plan without brushing or circulation support often disappoints.
Expect follow-up, not instant perfection
Most homeowner algae cleanups need more than one look. Retest after circulation, brush again, and check whether chlorine is holding or collapsing right away.
If the pool keeps sliding backward, do not keep improvising. Save the readings, move through diagnosis, and call for help if the water is not stabilizing.