Preparing Your Pool for Wildfire Smoke and Ash

Stop ash from ruining your water and equipment

When ash from nearby wildfires settles on your pool, it can compromise water balance and clog equipment within hours.

Ash is alkaline and full of fine particles and organic compounds. That combination raises pH, spikes chlorine demand, and can leave stains.

This post gives a clear playbook you can follow right after ashfall. Remove debris first, maximize filtration and circulation, then rebalance chemicals to protect water and equipment.

Avoid swimming until the water is cleared and properly balanced. We also explain when a professional technician should handle heavy debris or clogged filters.

Immediate cleanup steps to protect filters, pumps, and heaters

Got ash falling onto your pool right now? Act fast. The goal is to stop fine grit from entering the circulation system and abrading equipment.

Start with frequent mechanical removal before adjusting chemicals. Skimming and basket cleaning reduce the load on your filter and pump.

Daily actions that make the biggest difference

Skim the surface often and empty skimmer and pump baskets several times a day. When baskets clog, flow drops and the pump can overheat.

Cover your skimmer net with a fine cloth or old T-shirt to trap tiny particles that pass through standard mesh. Small change, big payoff.

• Run the pump continuously while ash is falling. Continuous circulation helps move particles to the filter instead of letting them settle.
• Vacuum settled ash to waste whenever possible. Sending ash out of the system prevents clogged filter media and preserves filter life.
• Do not hose deck debris directly into the pool. Mist the deck to keep dust down, then sweep up and dispose of ash as solid waste.
• Power off the pump at the breaker before opening the pump strainer lid. Wait for the impeller to stop, then rinse baskets gently with a hose.

Quick checks and when to call a pro

Monitor filter pressure daily. Clean or backwash when pressure rises 8 to 10 psi above the clean baseline.

If pressure keeps spiking after multiple cleanings, or you hear grinding, vibration, or see melted parts, call a technician. Those signs mean ash has stressed mechanical components and may need professional teardown or repair.

If you want a quick checklist of supplies that help in these emergencies, see our emergency parts guide for San Diego pool owners.

Daily tests and targets to restore sanitizer strength

Not sure what to test after ashfall? Start by focusing on the numbers that directly affect sanitizer performance and algae risk.

Ash drives pH and alkalinity up and creates a big chlorine demand. Test frequently and act quickly to keep your pool safe and clear.

Which parameters to prioritize

• pH: Aim for 7.4 to 7.6 to keep chlorine working at full strength.
• Free chlorine: Maintain at least 2.0 ppm, and plan for 3 to 5 ppm or higher during active ash events.
• Total alkalinity: Target 80 to 120 ppm so pH stays steady as you treat other issues.
• Phosphates: If levels exceed about 500 ppb, use a phosphate remover to cut algae food sources.
• Calcium hardness: Watch for 200 to 400 ppm to avoid scaling if ash raises mineral content.

How often to test while ash is present

Test at least twice daily during active ashfall, once in the morning and once in the evening.

Continue frequent checks until chemistry holds steady over several days. Then return to your normal weekly schedule.

Safe shock choices and stepwise dosing guidance

Remove as much ash as you can before shocking. Skim, vacuum to waste, and clean baskets and filters first. Otherwise you waste chemicals and overload the filter.

For chloramine and organic load, non-chlorine oxidizer (potassium monopersulfate) quickly breaks combined chlorine without long swim bans. It will not treat active algae.

Calcium hypochlorite is powerful for algae control but raises pH and calcium. Dichlor is gentler on pH but adds stabilizer.

As a guideline, routine shock aims for about 10 ppm free chlorine. Severe algae may need 20 to 30 ppm. Follow product labels and pool volume calculations.

A rough rule of thumb from common product strengths: 1 gallon of 12.5% liquid chlorine per 10,000 gallons raises free chlorine by roughly 12.5 ppm. One pound of granular cal-hypo per 10,000 gallons is a common starting point for granular products.

Shock at dusk or night to avoid sunlight loss, and run filtration continuously for 24 to 48 hours after treatment to clear oxidized waste.

For a full after-ash tune-up checklist and when to consider professional help, see our seasonal chemical tune-up.

When to clean, backwash, or replace filters after heavy ash

Not sure whether to backwash, hose off, or replace filter media after ashfall? Fine ash can quickly overwhelm filters and raise pump strain.

Monitor filter pressure daily and act fast. Clean when pressure rises 8 to 10 PSI above your clean baseline to keep flow and protect equipment.

Signs that cleaning is enough versus when media needs replacing

Cleaning or backwashing is the first move. Backwash sand and DE filters, and hose off cartridges.

Replace media when cleaning no longer fixes the problem. Persistent high pressure after cleaning, recurring cloudiness, or visibly degraded media mean replacement is due.

Cartridge care and professional soaks

Cartridge filters need more than a quick rinse when ash is embedded. Remove cartridges and hose them off first.

For heavy embedment, cartridges often need an 8 to 12 hour professional soak in cleaning solution to remove oils and microscopic ash particles.

Which cleaner to use, and precautions to avoid clogging plumbing

• Robotic cleaners trap fine ash inside their internal baskets, so they keep particles out of your pump and main filter.
• Empty robotic baskets often and use ultra-fine filter inserts when available. Clogged internal filters reduce performance and strain the motor.
• Manual vacuuming gives you control and is ideal for concentrated ash patches, especially when you vacuum to waste to remove ash from the system.
• Move the vacuum head slowly in overlapping lines to avoid re-suspending ash. Stop and let particles settle if the water clouds during cleaning.
• Suction-side cleaners pull ash into the main filter and skimmer. They can clog baskets and media quickly during heavy ash events.
• If you use a suction-side cleaner, check and empty baskets daily and be prepared to backwash more frequently.

If you still see fine particles after thorough cleaning, or pressure spikes return immediately, call a technician for inspection and possible media replacement.

For help diagnosing persistent cloudiness and next steps, see our troubleshooting guide at why San Diego pools cloud over and how to fix it fast.

When it's safe to swim again

Focus on three priorities: remove ash first, keep water moving, and test often. Skim and vacuum to waste, empty skimmer and pump baskets, and run the pump continuously while ash is present. Test chemistry at least twice daily and rebalance sanitizer, pH, and alkalinity until readings hold steady.

Protect filtration by cleaning, backwashing, or replacing media as needed and watching for repeated pressure spikes. Do not swim until the water is clear, sanitizer and pH are in target ranges, and circulation is stable.

• Keep a skimmer, fine cloth or mesh cover, and a manual vacuum handy.
• Stock spare cartridges or DE, a phosphate remover, and pool shock.
• Have reliable test strips or a digital tester and a non-chlorine oxidizer on hand.

Call a professional if cloudiness persists after cleaning, filter pressure keeps spiking, staining won't lift, or equipment shows damage or overheating. If you're in San Diego, Swimquip Pool & Spa Supply Center can help. Call us at (619) 282-2722 or visit our showroom at 10395 Friars Road.