Yellow algae in shady parts of pool

[09659]

Besides brushing, what should I do about yellow algae that keeps coming back in the shady parts of the pool? I can only service the location once a week.

 

[woodyp]

pool-school/mustard_algae

There ya' go.

 

[gonefishin]

http://www.troublefreepool.com/pool-school/mustard_algae

There ya' go.

Nicely written post on mustard algae

 

[09659]

Thanks

 

[chem geek]

Just remember that with yellow/mustard algae you need to completely eradicate it from all possible areas it likes to hide including behind light niches, under removable ladders, etc. If you don't, then it may come back because normal chlorine levels that prevent green and black algae growth are not sufficient to prevent yellow/mustard algae from growing. If you can't eradicate it, then you either need to maintain roughly double the normal chlorine level (so an FC that is around 15% of the CYA level instead of 7.5%) or you need to use other alternatives that are a last resort such as sodium bromide (turns the pool into a bromine pool, at least for a while) or a phosphate remover.