Since brown algae is extremely chlorine-resistant, several other chemicals such as shock and an algaecide specifically designed for mustard algae will help get rid of the infestation. This will often result in cloudy pool water, so use clarifier to correct this problem.
Mustard algae and most yellow/brown algae will like the bottom of the pool. The fastest way to get rid of these stains is to apply chlorine straight onto the discoloration. Scrub with a brush and watch it disappear. Run a water test to see what other stuff might be in the water, and treat accordingly.
In this instance, brown pool stains can have one of a few causes: algae, metal, or dirt buildup. ... And brown stains concentrated on the bottom can likely be attributed to dirt stains, typically enhanced by calcium buildup. The first step to deal with organic materials is to shock your pool, and scrub it.
While larger debris such as bugs and leaves get sucked up and caught in your skimmer basket, dirt usually falls to the bottom of the pool, creating a sediment that doesn't get circulated through the pool system and filtered out. Note: Dead algae is often mistaken for dirt.
A nylon or rubber brush is the correct choice for scrubbing the sides of a soft-sided above-ground pool. A large pool brush makes quick work of the job, but you may need a smaller brush to clean corners. Once the particles have been removed from the sides of the pool, turn your filter back on and agitate the water.
Scrubbing rust stains with a chlorine tablet can often remove the stain effectively. This is particularly true for brown stains in and around the pool, which is an indication of an iron buildup. If the stain is turquoise, copper causes it, and a tile cleaner will likely get rid of the stain.
Eliminate brown stains caused by iron by scrubbing the area with a chlorine tablet. If you cannot easily reach the spot to scrub it, duct tape the tablet to the end of a telescoping pole. Don't rub too hard or you can damage the fiberglass surface.
Causes of Inorganic Stains in a Fiberglass Pool
A Brown or yellow stain indicates the presence of iron, and a black stain is caused by Magnesium. Iron stains will always appear yellow on fiberglass pool walls and steps.
To eliminate this possibility, pre-dilute the acid first by adding the acid into a large plastic bucket of water, and then pour the acid solution into the deep end of the pool, away from skimmer and fixtures. Muriatic acid is NOT recommended for vinyl-liner, painted or fiberglass pools.
Along with balancing the pH levels of your pool water, muriatic acid is strong enough to kill mold, remove rust stains, get rid of calcium deposits, and clean the surfaces of your pool.
Cobalt stains which form on fiberglass swimming pools and spas can be removed by washing the fiberglass surfaces with a quantity of a mixture of benzalkonium chloride and EDTA Na4 mixed in a quantity of muriatic acid.
Super Iron Out is not recommended for pool water. Super Iron Out is safe to use in an empty pool to remove staining from walls, liner, etc. just not in a full pool.
If you do add too much muriatic acid, your pH levels can dip dangerously low, and your pool water can cause rashes and eye irritation. Low levels of pH can also damage metals in your pool like ladders, railings, screws, bolts, and other important equipment.
The appearance of brown algae on the bottom of the pool is a sign of the beginning of an infestation of mustard algae. This is one of the most difficult types of algae to get rid of, and gets its name from its yellowish-brown color.
We recommend adding Acid weekly! Adding a little and often is better for your water and can actually save you money overtime. Large doses over longer periods of time take a larger portion of your 'Total alkalinity' away.
HCl can be harmful to gelcoat, so never use it in concentrated form. Instead, always dilute it with water before being applying it to a boat. Tip #5. To prevent unwanted damage to the fiberglass, don't expose any gelcoat surfaces to muriatic acid for too long.
It's tough to answer abstract questions, but muriatic acid attacks fibreglass slowly if it all -- so judicious use of diluted muriatic acid probably won't harm your fibreglass tub.