Dealing with stubborn pool algae. What actually works?

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TristanC

New member
Alright, I need some help. My pool keeps getting patches of green algae, and no matter how much I shock it or brush it, it always seems to come back. Water chemistry is mostly balanced (I think?) but maybe I’m missing something. Do algaecides actually help, or is there a better way to keep it under control long term?
 
been there and its super frustrating. i used to just throw in shock and hope for the best but i learned the hard way that if your chlorine isn’t staying at the right level, algae keeps coming back. brushing is key too, since algae clings to surfaces. i started using a polyquat algaecide as a backup, and it made a huge difference.
 
I think besides using algaecide, it’s really important to scrub those hard-to-reach spots and make sure your water circulation is good. Algae loves to hide in spots with poor water movement. Staying consistent is key to keeping algae away
 
TristanC said:
Alright, I need some help. My pool keeps getting patches of green algae, and no matter how much I shock it or brush it, it always seems to come back. Water chemistry is mostly balanced (I think?) but maybe I’m missing something. Do algaecides actually help, or is there a better way to keep it under control long term?
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Green algae patches can be super frustrating. Shocking and brushing are the right moves, but if it keeps coming back, you might want to try adding an algaecide as a follow-up. It doesn’t replace chlorine but helps knock down those stubborn spots and keeps algae from regrowing quickly.

Also, double-check your chlorine levels and make sure your filter is running long enough to clear the dead algae out. Sometimes it’s not just the chemistry it’s circulation and filtration too. Keep testing regularly, and once you get it cleared up, a weekly dose of algaecide can keep it at bay.
 
TristanC said:
Alright, I need some help. My pool keeps getting patches of green algae, and no matter how much I shock it or brush it, it always seems to come back. Water chemistry is mostly balanced (I think?) but maybe I’m missing something. Do algaecides actually help, or is there a better way to keep it under control long term?
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Algaecides can definitely help, especially if you’re dealing with recurring patches. Think of them like a booster on top of your chlorine routine. If your water chemistry really is balanced, the problem might be in how long your pump runs or even debris hiding in corners.

I’d recommend shocking, brushing, then adding algaecide, and running the filter for at least 12 hours after. Also, vacuum any dead algae off the bottom so it doesn’t settle and come back. For long-term, keeping a steady chlorine level and weekly algaecide doses during warmer months works best for me.
 
You clean it, shock it, think it’s gone and then boom, it’s back a few days later. For me, it always seemed to show up in the same corners or shady spots.

Algaecide can help, but I’ve had better luck using it more as a backup, not the main fix. What really made a difference was running the pump a bit longer and making sure the filter was actually doing its job. Also worth checking if your stabilizer level is off, sometimes the numbers look fine, but something’s still messing with how the chlorine works.
 
TristanC said:
Alright, I need some help. My pool keeps getting patches of green algae, and no matter how much I shock it or brush it, it always seems to come back. Water chemistry is mostly balanced (I think?) but maybe I’m missing something. Do algaecides actually help, or is there a better way to keep it under control long term?
Click to expand...
Dealing with stubborn algae can be super frustrating. If you’re already shocking and brushing regularly but it keeps coming back, it might be time to try a few extra steps. First, check your filter sometimes algae can get stuck there, so make sure it’s clean or backwashed thoroughly. Algaecides can help in the short term, but they’re not a long-term fix. For lasting control, you’ll want to maintain proper chlorine levels and make sure your water chemistry is in check especially the pH and alkalinity. Also, try running the filter 24/7 for a few days and make sure it’s working at full capacity. If it’s still a problem, you might want to consider a different type of shock or a specialized algae treatment.
 
I feel your pain! It’s like a never-ending battle with algae. One thing I did that really made a difference was running my pump for longer, like 12-14 hours a day. I also started using a pool cover at night to keep debris from collecting. Surprisingly, this actually seemed to help with algae control too.
 
What finally broke the cycle for me wasn’t more chemicals, it was finding the one spot in my pool that never actually got any attention. In my case, it was behind the main return fitting. I only discovered it because I pulled the cover off to replace an o-ring and the whole area had a thin green film on it.

So you might be doing everything right, but if there’s even one small “micro-pocket” where water doesn’t move, algae will keep coming back no matter how much you shock or brush. Try checking behind ladders, around lights, and under the lip of steps, anywhere you normally don’t hit with the brush.

When I scrubbed all those hidden spots and ran the pump overnight, the algae stopped returning. If the water looks cloudy after all the brushing (totally normal), a little AquaDoc clarifier clears it fast.

Sometimes it’s that one overlooked area causing all the drama.
 
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