Use a pool brush with stiff bristles to effectively dislodge debris. Vacuuming: After brushing, attach the vacuum hose to the skimmer or dedicated vacuum port. Move the vacuum slowly and methodically across the pool bottom, paying extra attention to dirtier areas.
Another reason could be an excess amount of cyanuric acid (stabilizer) in the pool. However this is usually seen on the floor as a white fluffy residue and not on the walls as more commonly seen with a scale issue. Another reason can be too much polymers in the pool from the clarifier.
Even with regular skimming and cleaning, fine debris like dust, sand and dirt can get into the pool and settle to the bottom, forming a layer of sediment. These debris can come from anywhere like trees and warm breezes, but they're most commonly brought in from the bottom of people's feet.
How to remove dead algae from pool without a vacuum? Put magic erasers in your filter. Pull out skimmer basket. Wrap two skimmer socks around the basket. Put cotton balls in the top and bottom of the basket. This method helps to catch algae.
Here's what you'll need to do to get rid of it for good: Scrub your pool. Use a high quality nylon brush and give the black algae a good scrubbing. Remember, you'll need something tough and sturdy if you want to get past that built-in protective layer.
It's a super annoying problem to treat, it requires you to scrub with steel brush, then treat by scrubbing the spots with chlorine spots, then brush again, then quadruple shock your pool with hypo chloride, and then brush again, then run your pump 24 hours. It's going to take a week or 2 of observation to fix.
While larger debris like leaves get sucked up and caught in your skimmer basket, dirt is too tiny to be caught by any netted filters. Instead, it usually falls to the bottom of your pool, and doesn't get circulated through your pool system. That's why you might see dirt piling up in the bottom of your pool.
Diatomaceous earth (D.E) filter
DE filters are compact and filter out the smallest particles in comparison to sand and cartridge filters. The filter is backwashed similar to the sand filter, but unlike just backwashing alone, the filter always needs fresh DE powder added.
Once the algae is killed, some of it will be captured in the filter, but because the dead algae particles are so fine, they will settle to the bottom of the pool, usually appearing as a gray or brown dust.
Start vacuuming. It's common practice to start from the shallowest part of the pool and move deeper until you reach the bottom. If you do it the other way around, the sediments at the higher points of the pool may drop to the bottom, and then you'll have to vacuum it again.
Calcium scaling is an unsightly white to white-grey stain, dust, or film that forms on pool sides or tile when a pool's calcium levels and pH are imbalanced. Not to worry though, calcium scaling is an easy thing to prevent with regular water testing and balancing.
White dust is usually some type of calcium carbonate (CaCO3). The calcium carbonate either came from an oversaturation in the water or was drawn out of the cement in a pool finish. If you have a vinyl liner or fiberglass pool, the dust is likely from an oversaturation of calcium carbonate (+0.31 LSI or higher).
Run your filter 24 hours a day and backwash 3 or 4 times a day for quickest results. Green or cloudy water will quickly clog a filter, therefore you may have to backwash your filter many times a day until the pool clears. THIS IS NORMAL ! Remember, you cannot over-backwash a pool filter.
Removing Sediment from the Pool Floor
If there has been a serious invasion of excess dirt and debris, you may also need to shock your pool. Vacuuming is recognized as the only way to remove sediment from the bottom of a pool.
For a 10,000-gallon pool that has a pH of lower than 7.2, between 3 to 4 pounds of baking soda should be enough to raise the levels. Start by using about half of the amount of baking soda that you think you should use. Test the water afterward to see if you need to put in more baking soda.
'Adding baking soda to your pool will raise both the pH and alkaline level, which will help increase the pool's clarity and improve stability,' she says. Many commercial pool cleaners use baking soda as their main active agent – but you can create a more natural remedy by going to the source of the solution.
To clean up the pool floor, using a vacuum is best. 'A pool vacuum is the most effective tool for removing dead algae on the pool floor,' says Hubert Miles. This Dolphin Nautilus CC Plus robotic pool vacuum cleaner on Amazon is one of its best-sellers.
Shock the pool overnight, then put Floc the next morning and run the pump on "recirculate" for 2 hours then shut pump off for 12-24 hours. The shock will kill the algae, the floc will clump all the particles together at bottom of pool. Slowly vaccuum to waste and make sure your water level is good.
Shocking increases your pool's chlorine and other chemical levels and is a black algae killer. Now, because black algae are so difficult to kill, we recommend using four times the recommended dosage for your size pool.
Walk around the edge of the pool adding 1 bag of Rust and Iron Stain Remover and 1 bag of Copper Stain Remover. This will both reduce the chlorine level to 0 ppm and help to remove the black or other color of the water.
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.