Either your filter needs to be cleaned or replaced.
To dissolve the algae in a clogged pipe, you will have to turn on the dry or wet vacuum.
It sounds like A bad case of green algae. First try to kill it of with an algaecide follow the instructions If that is taking too long you may have to flocculate the water and then vacuum the algae to waste.
Algae is non-vascular and it is classified in the Kingdom Protista.
Algae lack specialized tissues like roots, stems, and leaves that are present in plants. Instead, algae have simple structures for attachment and nutrient absorption.
Carbon dioxide (CO2) is removed from the atmosphere by plants and algae through the process of photosynthesis. They use CO2 during photosynthesis to produce oxygen (O2) and carbohydrates.
If the pool is shocked give it a scrub down with a pool broom / brush leave it for a day then vacuum the rubbish of the bottom. If there is a lot of algae present Vacuum to waste
If it is genuine 'black algae' it is very difficult to remove without emptying the pool and gouging the black algae out of the pool surface. Other algae can be removed by shocking the pool, filtering continuously and brushing walls while maintaining a good sanitizer level.
Cloudy green pool water after algae treatment can be due to several factors. Even after killing the algae, dead algal cells and debris can remain suspended in the water, contributing to cloudiness. Additionally, improper filtration or insufficient circulation may prevent these particles from being effectively removed. It's essential to vacuum the pool, run the filter continuously, and possibly use a clarifier to help clear the water.
Algae spores float around in the air and can hit your pool at any time You can fix it by 1 shocking the pool and scrubbing the walls and floor of the pool if this doesn't clear it up just get an algaecide from your pool shop. When you vacuum the dead algae out of the pool it would be a good idea to vacuum it to waste to reduce the risk of reinfecting the pool.
with a hand vacuum you would be best of vacuuming it to waste in order to get rid of it Al rather then stopping it with the filter and then backwashing.
Green pool water is caused by algae. To remove the algae, bring the pH level of the water to 7.8, scrub the sides and bottom of the pool, shock the water with chlorine, then vacuum up all the dead algae.
When Algae runs out of the proper nutrition it needs such as phosphates and other minerals it dies. Algae then dies and starts to decay during the decaying process Algae uses oxygen which is also why fish die from lack of oxygen. So to answer this question yes Algae does decay and consume oxygen.