Stagnant water is a breeding ground for algae. Make sure your pump and filter system run at least 1 hour per 10 degrees. So if it's 80 degrees outside, you run the pump 8 hours during the day. Variable speed pumps can run a little bit different. A well-functioning filter removes debris and microscopic algae spores before they can multiply.
Algae thrive in imbalanced water. To keep them out, check your pH, chlorine, alkalinity, and calcium hardness levels at least once a week. Aim for:
pH: 7.2-7.6
Chlorine: 2-5ppm (parts per million) or 7% of your CYA levels.
Alkalinity: 80-120 ppm
Calcium Hardness: 200-400 ppm
A weekly shock treatment boosts chlorine levels, killing off any potential algae spores before they spread. Use a chlorine-based shock in the evening and let the system run overnight for the best results. This is only necessary in the summer when temps are incredibly high.
Algae love to cling to pool walls, floors, and corners. Brushing your pool weekly loosens spores before they can settle and grow. Follow up with a vacuum session to remove any debris that could feed algae growth.
Leaves, dirt, and pollen introduce nutrients that algae feed on. Use a pool cover when not in use, skim your pool daily, and clean out skimmer baskets to remove debris quickly.
CYA stabilizes chlorine, keeping it effective against algae. However, too much CYA can make chlorine less effective. Keep CYA levels between 30-50 ppm to ensure your chlorine works as intended.
Algae thrive in warm water. If possible, keep your pool temperature below 85°F to slow down algae growth. If your pool gets a lot of sun, consider using a pool cover to reduce heat absorption. This also helps keep the water nice and cool when you want to go for a swim!
Sometimes, the best way to keep algae at bay is to let a professional handle it. A pool maintenance service can test your water, adjust chemicals, and perform deep cleanings to ensure algae never becomes a problem.