There are a lot of things in the pool that are unseen to the eye. There are bacteria of course and single cellular organisms. But the single cellular organisms can become clusters of them and eventually become visible to the human eye. They are something you smell and see while you are swimming when the swimming facility is not sanitized very often. They are called, algae. They can thrive in many different environments. They can thrive in salt water or fresh, cold or warm. These are the more common species in your swimming area ,and they are named after their color.
This sort can spread through the swimming area very fast and become a big problem overnight especially after a rainstorm. They feed off of nitrogen. Lightening and rainstorms give out plenty of nitrogen giving the green algae a feast. Therefore this is the most common type and the biggest problem for swimming pools.
These are also known as "mustard algae". Just like the name indicates, this types of algae is yellow. These types are not aggressive growers like the green algae but like to take time to spread. It may be several weeks before you notice them. By then it will be hard to handle the growth. These kinds are hard to destroy because by the time you notice their growth; their protected shields have been built around them. These shields protect the organisms from any oxidization. Therefore oxidizing with chlorine will not affect this variety of algae. They prefer to thrive in the dark parts of damp sections such as: the plumbing and filters, where it is difficult to keep clean. You will need to treat this type with products designed solely for them. It is common to have to treat the area more than once in order to destroy them.
This sort loves to grow and take over places such as: corners and places with poor circulation. Because of the poor circulation of the fluid, no just any sanitizing method cannot get to these parts. They are very a stubborn species that develop cells specializing in locking deep into pores of the surfaces it lives on. On top of the specialized cells, they have a strong outer layer of a waxy coating that keeps chlorine from penetrating, making them hard to destroy. Therefore the only solution to these problems will be to penetrate and destroy down to the last cellular wall thriving in deep pores. It is necessary to use more than one method or solution to kill this variety. Scrubbing down to the pores of the affected section is very necessary.
Algae are organisms that can spread and give you issues of cleanliness. It is important to make sure you clean and scrub the surface with necessary chemical solutions without harming your pool surface. It is important to keep good circulation so the solution is not kept stagnant for too long. Sanitize your surface daily and you should be able to be one step ahead of the growth.