Pool Algae Removal in Houston: Cost, Timeline, and When to Call a Pro

The Short Answer

Professional swimming pool algae removal in Houston runs $400–$1,200+ as a one-time job, separate from monthly service. Most pools go from green to clear in 3–5 days; a full swamp can take 5–7.

Where a pool lands in that range comes down to how far gone the water is, how much water there is, and what shape the filter is in. Below: how the price is built, how long each stage takes, and how to tell a weekend DIY job from one to hand off.

What Pool Algae Removal Costs in Houston

Admiral quotes green pool cleaning and algae removal as a single one-time job: $400–$1,200+, set by the pool rather than by a package. A recovery follows the same six steps every time:

1. Test and diagnose. Chlorine, pH, alkalinity, stabilizer (CYA), and phosphates, so the treatment fits the cause and not just the color.
2. Shock and algaecide. Dosed for the pool's volume and the type of algae.
3. Brush and vacuum. Dead algae has to be physically removed. Left in the pool, it comes back.
4. Deep-clean the filter. The filter loads up with dead algae during treatment and gets backwashed or cleaned as often as it takes.
5. Balance the water. pH, alkalinity, calcium hardness, and stabilizer are brought back into range once the water clears.
6. Final check and report. What was done, and what to change so it doesn't happen again.

Weekly service is a different thing with a different price. It starts at $215/month, and its job is keeping a clear pool clear.

What Moves the Price

How far gone the water is. This is the biggest factor. Light green water with the bottom still visible is early-stage algae and sits at the low end. Dark green water you can't see through takes repeated treatment. Black or brown water with leaves on the floor is the top of the range and beyond.

How much water there is. Chemical doses scale with volume, and so does the time the filter needs to turn the whole pool over.

The filter. A sand filter can be backwashed quickly. Cartridge and DE filters have to be opened and cleaned by hand, sometimes several times in one recovery. A filter that was already overdue for a cleaning slows everything down.

Stabilizer (CYA). Years of chlorine tablets push CYA up, and Houston pools run tablets nearly year-round. When CYA is very high, shock can't do its work until some of the water is drained and replaced. That adds time and cost. More on that in how to lower CYA.

Debris. Leaves and sludge have to come out before the chemistry can win.

Equipment that isn't running. If the pool turned green because a pump or filter failed, that repair is quoted on its own. The diagnosis visit is $125, credited toward the repair if you go ahead, and it's usually within 48 hours. See pool equipment repair.

What the water looks like	Typical timeline	Where the price tends to land
Light green or cloudy, bottom still visible	Short end of 3–5 days, sometimes sooner	Low end of the range
Dark green, bottom not visible	3–5 days	Middle of the range
Black or brown, debris on the floor	5–7 days; extreme cases 2+ weeks	Top of the range and above

How Long Algae Removal Takes

Most pools clear in 3–5 days. A full swamp can take 5–7, and extreme cases can take 2+ weeks.

The clock is mostly the filter's. Shock kills algae quickly; getting the dead algae out of the water is what takes days. Four things stretch the timeline:

• High CYA, which blunts the shock until water is replaced
• A slow or undersized pump, which takes longer to move treated water through the filter
• Cartridge and DE filters, which need hand-cleaning between rounds
• Rain, which dilutes the chemicals and brings new phosphates in

There's a stage-by-stage breakdown in how long it takes to clear a green pool. If the pool went green after a hurricane, a freeze, or days without power, start with the Houston pool emergency guide instead. Storm recovery has its own order of operations.

DIY vs. Hiring a Pro

Clearing a pool yourself is realistic when the water is light green, you can still see the bottom, the pump and filter are running, and you have a real test kit rather than test strips.

For a dark green pool, the chemicals alone typically run $200–$300. The larger cost is time: testing, brushing, and cleaning the filter every day until the water turns, with no guarantee the first attempt works. The usual reasons it doesn't:

• Shocking without brushing. Algae has a protective layer that chlorine can't get through until it's broken up.
• Not testing CYA. If stabilizer is too high, chlorine reads high and the pool stays green.
• Under-dosing. A light dose doesn't finish the job, and the pool is green again after shocking.
• Leaving the filter alone. Once it clogs with dead algae, it stops clearing the water.

When to Call a Pro

• You can't see the bottom of the pool.
• You've shocked it and it's still green, or it cleared and came back.
• Chlorine tests high and the water is still green.
• There are dark spots on the plaster that don't brush off. That's black algae, the most stubborn kind, and it often needs professional treatment.
• The pump or filter isn't running right.
• There's a deadline (a closing, an HOA notice, guests) and no room for a failed first attempt.

Waiting is the expensive option. The longer a bloom sits in Houston heat, the more treatment it takes.

After the Water Clears

A pool that turned green once will do it again if nothing changes. Prevention is routine: steady chlorine, enough pump run time in summer, weekly brushing, and a clean filter. Why pools turn green covers the causes.

Admiral's weekly pool cleaning starts at $215/month with all chemicals included. Final pricing depends on pool size, features, condition, and service needs.

Pool Algae Removal FAQ

How much does it cost to clean a green pool in Houston? $400–$1,200+ as a one-time service, separate from monthly maintenance. Severity, pool volume, and the condition of the filtration set the number.

How long does it take to clear a green pool? Most pools clear in 3–5 days. A full swamp can take 5–7.

Do you have to drain the pool to remove algae? Usually not. Most green pools are cleared with the water that's already in them. A partial drain comes into it when stabilizer (CYA) is too high for chlorine to work.

Is algae removal included in weekly pool service? No. Recovery is a separate, one-time job. Weekly service is what keeps the algae from coming back.

Can I swim in a green pool? No. Green water means the sanitizer isn't keeping up, and if you can't see the bottom you can't see a swimmer in trouble either. Wait until the water is clear and balanced.

What's the difference between green, mustard, and black algae? Green algae floats free and turns the whole pool cloudy green; it's the most common and the easiest to treat. Mustard (yellow) algae clings to walls and shady spots and resists chlorine. Black algae roots into plaster and grout and is the hardest to remove.

Get a Number for Your Pool

A range only goes so far. Request a green pool recovery quote or call (281) 624-6191 and tell us the size of the pool and what the water looks like. Admiral is based in Friendswood and serves League City, Pearland, Clear Lake, and the rest of the Houston Bay Area.