Why is my pool green?

Why is My Pool Green? Causes & Remedies

In Pool Health by Les Greenfield, Owner / Operator

So your pool is green?



What is more inviting than a clear swimming pool, with cool blue water, reflecting the sunlight? Over the course of the summer, you might have noticed some green creeping into your pool, or maybe you’ve gone out one day and found that the water has completely turned green. There are several different causes for the greenness, and also, remedies that you can make to get your pool water clear again.
Improper pH balance.
If you think of your pool as its own little ecosystem, there are certain conditions or weather systems that may throw off its pH balance. A pool is considered healthy when its water registers 7.2 to 7.8 on the pH scale. When there are heavy storms, warm humid days, a combination of algae and bacteria, the pH might tip in either direction and affect the color of the water. Regular testing the pH balance of your pool water is recommended, using kits you might find at a pool maintenance business. If the pH level is too low, the acidic water might damage metal or plastic components on the pool, whereas if the pH level is too high, it might facilitate the buildup of minerals and bacteria. Depending on the problem, you can sanitize or shock the pool with chlorine to balance the pH.
Algae.
Algae is a microorganism that coincides with warm, humid weather. If there are trees or plants near the pool that create shade over the water, algae may congregate here. To determine how much algae is in your pool, consider the color of the water. If it is light green or teal, then you have a low level of algae, and a double shock (2 pounds of chlorine to 10,000 gallons of water) will solve the problem. A medium level of algae turns the water dark green, which can be treated with a triple shock (3 lbs to 10,000 gallons). If the water is black-green, then you have a very high level of algae, which can be eradicated with a quadruple shock (4 lbs to 10,000 gallons). When the water becomes a cloudy blue color, then you’ll know that the chlorine shock has killed your algae. Run your filter and pump until the water becomes clear.
Pool filters.
Sometimes, the cause for green water is not biological. When your pool filters are clogged, the debris and surface algae in your pool is not strained out. A green pool, usually, is a dirty pool. To clear out your filters, take out the baskets and remove the junk. Scrub these baskets down with brushes until they are clean. Depending on the type of filter you have, you may have to clean them daily to weekly. If you believe your filter system to be damaged, call a repairman to have it fixed. You may have to run the filter with more frequency with more swimmers in the pool. Also, you might want to run your filter 10 out of every 24 hours, depending on the number of swimmers you have. This filtration prevents stagnated water, which is usually a breeding ground for unwanted growth.
Interested in switching your pool from chlorine to saltwater?
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