pool is green what to do

If your pool is green, it’s almost always algae plus low sanitizer or poor circulation, and you can usually clear it in a couple of days with the right steps. Here’s a quick, practical plan.

First checks (before adding chemicals)

• Make sure the pump and filter are running properly and there are no blockages in skimmer baskets or return jets.

• Scoop out leaves and debris so chemicals can work on the water, not on junk at the bottom.

• If the pool is extremely dark green or you can’t see the first step, do not swim in it until it clears and chemistry is balanced.

Step‑by‑step “green to clean” routine

1. Test your water.
   • Check free chlorine, pH, alkalinity, and (if you can) stabilizer/cyanuric acid.

 * Aim to get pH around 7.2–7.4 before you “shock” the pool so chlorine works effectively.

2. Clean and prep the system.
   • Empty skimmer and pump baskets, then backwash or clean the filter so it can trap dead algae.

 * Plan to run the pump continuously for 24–48 hours during treatment.

3. Brush, brush, brush.
   • Brush walls, floor, and steps thoroughly to break algae off surfaces and into circulation.

 * Pay extra attention to corners, ladders, light niches, and behind steps where algae hides.

4. Shock the pool (superchlorinate).
   • Use a chlorine-based shock; non‑chlorine shock won’t reliably kill a heavy algae bloom.

 * Dissolve granular shock in a bucket of water and slowly pour around the pool with the pump running, following label dosing for your pool volume and algae severity.

 * It’s often best done late afternoon or evening so the sun doesn’t burn off chlorine quickly.

5. Run the pump and filter non‑stop.
   • Keep circulation going 24/7 while the water shifts from green to cloudy blue to clear.

 * Backwash or clean the filter whenever pressure climbs or flow drops, because dead algae clogs it fast.

6. Repeat brushing and vacuuming.
   • Brush at least once or twice a day during recovery to keep algae from re‑settling.

 * Vacuum to waste if you have a lot of dead algae on the floor so you don’t push it all back through the filter.

7. Re‑test and balance once it turns blue/cloudy.
   • When the water is no longer green, test again and adjust pH, alkalinity, and chlorine into the normal ranges (free chlorine roughly 1–3 ppm for most pools).

 * Balanced pH and alkalinity help your chlorine stay effective so the pool doesn’t go green again in a few days.

Why it went green (so it doesn’t happen again)

• Low chlorine or sanitizer: The most common cause; algae blooms when sanitizer drops near zero for even a couple of warm days.

• Poor filtration or short run times: If your pump only runs a couple of hours a day, the water doesn’t circulate enough and dead spots grow algae.

• Unbalanced water (high pH, low alkalinity): Makes chlorine much less effective, so you think “I have chlorine in there” but it’s not doing the job.

• Warm weather, sunlight, and debris: Heat, sun, and organic load (leaves, pollen, dust) all feed algae growth.

Simple prevention habits

• Test at least 1–2 times per week in season and adjust chlorine and pH promptly.

• Keep the pump on long enough daily (often 8–12 hours in summer, depending on pool size and equipment) for full circulation.

• Brush weekly and keep skimmer baskets and filters clean so algae has fewer places to grab on.

• Consider a good pool cover when not in use to reduce debris and sunlight exposure on the water.

If you tell me:

• rough pool size (liters or gallons),
• whether it’s salt or chlorine, and
• how green it is (light tint vs dark swamp),

I can walk you through more precise shock amounts and a 24‑ to 48‑hour plan tailored to your pool.