Green Pool Cleanup
A green pool is not a routine cleaning — it is an algae bloom that needs an aggressive, multi-day chemical and filtration process to reverse. Trying to fix it with a single shock treatment usually just turns it a different shade of green.
Why this is not a normal cleaning
Green water means an algae population has overwhelmed the sanitizer. A single dose of shock, even a large one, is competing against algae that keeps consuming it — and if the filter is not running to clear the dead algae out, the water can shift from green to cloudy grey rather than to clear.
A proper cleanup runs the filtration and chemical process together over several days, rather than treating it as a one-time dose.
How the process runs
- Remove debris and brush thoroughly. Algae attached to walls and steps is brushed loose so chemical treatment can reach it.
- Test and shock accordingly. Dosing is based on how severe the bloom is, not a fixed amount — a lightly green pool and a swamp-green one need very different doses.
- Run the filter continuously. Filtration has to keep up with the dead algae being produced, which is why the pump runs around the clock during cleanup rather than on a normal schedule.
- Backwash or clean the filter repeatedly. Dead algae loads the filter fast; expect to service it more than once during the process.
- Re-test and re-dose as needed. Cleanup is rarely a single application — expect to re-check chemistry daily until the water clears.
- Vacuum settled debris. Once clear, dead algae settles and needs vacuuming out, sometimes to waste rather than through the filter.
How long it takes
Two to four days for a moderate bloom with the pump running continuously. A severe, long-standing bloom, or a pool with a failing pump or filter that cannot keep up, can take a week or more and may need equipment attention alongside the chemical process.
What it costs
| Severity | Cost |
|---|---|
| Light green, recently lapsed | $300–$450 |
| Moderate bloom, several days to a week neglected | $450–$650 |
| Severe, swamp-green or long-neglected | $650–$850 |
| Plus equipment repair, if the pump or filter has failed | Quoted separately |
What this project needs measured
Measurements are only requested when they change the price of the work you selected. Everything below is collected inside the estimator — you can enter dimensions you already know or measure as you go.
Required
No measurement required
This project is diagnosed from symptoms and equipment details rather than dimensions.
Only if it applies
Pool interior surface area
Resurfacing and finish work are priced by the square footage of the interior shell.
What the estimator will ask you
- How long the pool has been green
- Whether the pump and filter are currently running
- Pool type and approximate size
- Photos of the water and the equipment pad
- Whether any chemicals have already been added
How to read a PoolSavr estimate
- Step 1
Instant estimate
Based on your project selections and general pricing assumptions. Useful for deciding whether a project is realistic.
- Step 2
Measured estimate
Uses your pool, spa, or deck dimensions to price the work against the areas actually being resurfaced, tiled, or replaced.
- Step 3
Contractor proposal
Prepared by a licensed professional after inspecting the site. This is the only number that becomes a contract.
PoolSavr is an estimating and matching platform. We do not perform pool work ourselves — licensed local professionals do. Contractors pay PoolSavr for qualified project leads, which is how the estimating tools stay free for homeowners. A PoolSavr estimate is a planning range, never a guaranteed quote — read thefull estimate disclaimer.
Frequently asked questions
- How long does it take to clear a green pool?
- Two to four days for a moderate bloom with the pump running continuously. Severe or long-neglected cases, or ones complicated by failing equipment, can take a week or more.
- Can I fix a green pool myself?
- For a lightly green pool with working equipment, yes — heavy shock dosing, continuous filtration and repeated brushing over a few days often clears it. Severe or long-standing blooms are harder to judge correctly and are where professional cleanup earns its cost.
- How much does green pool cleanup cost?
- Typically $300–$850 depending on severity, plus any equipment repair needed separately if the pump or filter has failed and contributed to the bloom.
- Why did shocking my pool once not fix it?
- A single dose competes against an actively growing algae population and is often consumed faster than expected. Cleanup usually needs repeated dosing over several days alongside continuous filtration, not one application.
- Will a green pool damage my equipment?
- Extended neglect can — a pump straining against a clogged filter, or algae fouling components, adds wear. It is worth having the equipment checked as part of cleanup rather than assuming it came through unaffected.
Ready to see what your project costs?
Start with the work you are considering. You will get a preliminary range before anyone asks for your phone number, and you decide whether to request a contractor review at the end.