For citric acid for pools.
Citric acid wash for pools.
9 kg of soda.
Wet the sides of the pool.
If it works an acid wash would be a good next step.
Use a half a pound of vitamin c for every 10 000 gallons of water.
Fill the can with 1 gallon of water and then add 1 gallon of citric acid always in that order.
In your five gallon bucket add one gallon of acid to one gallon of water never the other way around.
The acid wash is applied from a watering can used for flowers.
Rinse out the bowl.
Dispose of what you pumped as the acid can kill frogs fish and plants.
You will need to use 2 lb.
A citric acid wash is most effective on a swimming pool that has been cleaned with all debris removed after it is drained.
An acid wash would likely remove it you can test by lowering the water level down below the first step and pouring a 50 50 acid water mixture from a flower watering can over the step scrubbing briefly and hosing off within 60 seconds.
Apply soda ash to the acid puddle scrubbing the mixture with a pool brush.
Pump the mixture into a bowl using a submersible pump.
If you are treating larger stains or decided to buy a liquid acid sprinkle the acid evenly around the pool.
Mix it gently with a mixing stick if you need to.
Spray down the sides of the pool and make sure the entire surface is wet.
4 1 out of 5 stars 105.