Black algae is very tough, it sends roots into the concrete of concrete pools. before bombing it with strong algaecide destroy as much of it as you can with an steel or copper brush and vacuum the remains to waste the next day when the water has settled down. You are better of not letting the stuff into your filter as it may may reappear if it not entirely dead.
Bleach or Clorox.
What is the best way to get rid of rough spots on pool steps??
Brush vigorusly with a S. S. wire pool brush and treat with granular black algaekill. Treat frequently because it is very hard to kill this type.
No Black algae can be found every where from the shower cubicle to the the water in the sea, unless you have some particular allergy to it there is nothing to worry about. However if there is algae in the pool, it is best to get rid of it as it will effect the effectiveness of the pools disinfection system, Black algae is particularly hard to get rid of and should always be tackled is quickly as possible
You can use a black hole
If there are just a few spots and you do not wish to drain the pool you must first scrape the "head" off with a wire brush or algae stone and then apply a granular/powder chlorine directly on top of the spot. If the pool is riddled with the stuff it would probably be easier to drain the pool, scrape off the heads of the black algae and then chlorine wash the pool. Let the chlorine sit for a half hour before rinsing.
With either a skimming net or get an effective floating pool skimmer
thats a bad idea to have an inground salt water pool in concrete. the salt water it self may eat away some parts of the concrete, plus the fact that its underground and contains salt it attracts worms. maybe you should pour alot of clorine in the pool to kill them, then empty out the water and start fresh.
get rid of the concrete! / get a plumber!
burn them
More filtration. What is the filter run time? What delineates "perfect"? 3.0 Chlor, 7.5 pH, spot on alkalinity?
The RID master will allocate the pool of RIDs to the DC, So we can create the objects without RID master. When this RID pool exhausted we can't create object.