Green algae is usually due to low/no chlorine and phosphates . The first thing we usually check for is nitrates. After around 10-15 ppm of nitrates, swimming pools become very difficult to get back to blue. The next thing we do is a detailed analysis of the water chemistry. We have quite a few different options to get a green pool back to blue. If the pool is extremely green and slimy, we usually shock the pool, balance out the stabilizer, and add super floc. Super floc helps to congeal and clarify the pool. We shut off the pump and let the mixture set. We then clean the pool 24-48 hours after the initial treatment. We would then manually vacuum out the debris and focus on balancing the alkalinity and ph. Once the pool is relatively clear, we can start the normal pump time and install the filter.
The main causes of yellow algae are low circulation, low alkalinity, and low sanitation levels. A normal yellow algae treatment involves balancing the chemicals, shocking the pool, adding yellow treat, making sure the pool is circulating correctly, and lots of time spent brushing the pool.
Black algae is one of the more difficult algae to treat. It is commonly seen as small black dots on the bottom and sides of the pool. Black algae can permanently embed itself into the pool surface making it very difficult to fully destroy. Some people will have the pool drained and cleaned while others opt for balancing the water and treating the black algae topically with pepper algae treat.
Water clarity issues usually stem from poor water chemistry or bad filtration. Try checking the filter to make sure its working properly.