Pool Algae Removal That Stays Gone.
Shocking a green pool without diagnosing why it turned green is how you end up shocking it again next month. We fix the cause first.
Stop Throwing Shock at a Problem You Have Not Diagnosed
Pool algae removal is what we get called for, but shock treatment alone is rarely what the pool actually needs. The homeowner has usually tried that already. A bag of cal-hypo from the pool store, maybe two, dumped in at sunset. The water lightens for a day. Then it greens right back up.
That cycle repeats because the shock is treating the symptom. Algae blooms when something in the system fails: the pump died and sat for a week, the filter cartridge collapsed and stopped catching anything, or cyanuric acid climbed past 100 ppm and locked the chlorine into a form that cannot kill a thing. Until someone figures out which failure let the algae in, no amount of granular shock will keep it out.
So that is where every algae call starts for us. Not at the chemical shed. At the equipment pad and the test kit.
Green, Yellow, Black, and Pink Are Not the Same Fight
Green algae is the common one and the easiest to kill. It floats, it clings to walls, it responds to a proper shock dose and aggressive brushing within a couple of days. Most green pool calls are this. The water looks terrible, but the fix is straightforward once the underlying equipment issue is handled.
Yellow algae, sometimes called mustard algae, is a different animal. It settles on shaded surfaces and looks like fine sand or pollen that brushes off easily and reappears by the next morning. Standard chlorine levels barely touch it. Yellow algae requires a targeted algaecide on top of the shock, and everything that touched the water (nets, brushes, hoses, pool toys) has to be sanitized or it reseeds from the equipment.
Black algae is the one that scares people, and it should. It roots into plaster and grout with a protective head that chlorine cannot penetrate from the surface. You have to physically crack through each spot with a stainless steel brush before the chemical can reach the root structure underneath. We see this most often in older pools around the Inland Empire where the plaster has gone porous.
Pink slime is not technically algae at all. It is a bacterial biofilm that forms around returns, skimmer throats, and inside plumbing lines. Surface treatment misses most of it because most of it lives where you cannot see it. We treat the visible growth and purge the lines to clear what is hiding inside the pipes.
Send us a photo and tell us how long it has been green. That is enough to start.
Send a Photo of Your PoolWhat a Real Algae Cleanup Looks Like
We test the water on arrival: free chlorine, pH, CYA, and alkalinity at minimum. If CYA is above 80 or 90, chlorine is effectively useless at any dose, and a partial drain to dilute it comes before anything else. No point pouring shock into water that cannot use it.
Once the chemistry allows it, we hit the pool hard. Liquid chlorine dosed to push free chlorine well above breakpoint, brushed wall by wall, floor included, with the pump running 24 hours. The filter takes the brunt of the dead algae, so we clean or backwash it daily during the process. A single visit is not a green pool cleanup. Most take two or three trips over three to four days before the water is holding clear on its own.
After the water clears we rebalance everything from scratch. pH, alkalinity, calcium, CYA, salt level if you have a chlorine generator. Then we check the filter one more time, because dead algae clogs cartridge pleats and DE grids faster than anything else we deal with.
Worth Asking Before You Call
How long does it take to clear a green pool?
Most green pools clear in two to four days depending on severity. A light bloom with visible floor might clear in 48 hours. A pool where you cannot see the second step needs multiple rounds of brushing, shocking, and filter cleaning, and usually takes three to four days of continuous filtration before the water turns.
Should I drain the pool instead of treating it?
Usually no. A drain-and-refill sounds faster, but it wastes thousands of gallons and still leaves algae spores on the plaster. Chemical treatment kills what is growing on the walls and inside the plumbing. We only recommend draining when CYA levels are so high that chlorine cannot do its job, or when the water has been stagnant long enough that TDS makes balancing impractical.
Will the algae come back after you treat it?
Not if the underlying cause gets fixed. We do not just shock and leave. We figure out whether the problem was a dead pump, a clogged filter, chlorine locked behind high CYA, or simply missed service visits. Correcting that root cause is the difference between a one-time cleanup and a recurring problem.
200+ Neighbors Can't Be Wrong.
Join hundreds of satisfied pool owners across Southern California.
“Came home from vacation to a green pool. They had it clear in two days. Not a trace of algae left. I was honestly shocked how fast they turned it around.”
“We had yellow algae that kept coming back no matter what we tried. They identified the source, treated the whole system, and it has not returned.”
“Black algae on our plaster was spreading. They came out, brushed every spot, shocked the pool properly, and followed up twice. Pool looks incredible now.”
“Pool turned green after a pump failure. They came out the next day, triple shocked it, brushed the walls, ran the filter around the clock, and it was clear by Wednesday.”
“Pink slime kept showing up in the skimmer and around the jets. They treated the entire plumbing system, not just the visible spots. It has not come back.”
“Our pool guy said the algae would take a week to clear. These guys did it in 48 hours. Brushed, shocked, filtered, and followed up. Night and day difference.”
“We tried every algae product at the pool store and nothing worked. One visit from them and the pool was turning around. Clear water within three days.”
“Mustard algae on the walls and floor that came back every week. They found it was hiding in the filter too. Cleaned everything, treated the whole system. Gone for good.”
“Came home from vacation to a green pool. They had it clear in two days. Not a trace of algae left. I was honestly shocked how fast they turned it around.”
“We had yellow algae that kept coming back no matter what we tried. They identified the source, treated the whole system, and it has not returned.”
“Black algae on our plaster was spreading. They came out, brushed every spot, shocked the pool properly, and followed up twice. Pool looks incredible now.”
“Pool turned green after a pump failure. They came out the next day, triple shocked it, brushed the walls, ran the filter around the clock, and it was clear by Wednesday.”
“Pink slime kept showing up in the skimmer and around the jets. They treated the entire plumbing system, not just the visible spots. It has not come back.”
“Our pool guy said the algae would take a week to clear. These guys did it in 48 hours. Brushed, shocked, filtered, and followed up. Night and day difference.”
“We tried every algae product at the pool store and nothing worked. One visit from them and the pool was turning around. Clear water within three days.”
“Mustard algae on the walls and floor that came back every week. They found it was hiding in the filter too. Cleaned everything, treated the whole system. Gone for good.”
Where We Offer Pool Algae Removal
We provide pool algae removal throughout our Inland Empire and Orange County service area:
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(951) 215-6142Emergencies: 24/7 support for urgent issues
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