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Lijong Tao

  • Posts: 5
Sodium Hypochlorite
« on: March 06, 2022, 02:31:29 am »
I've been asked to clean a patio for a family member, it is filthy and green with algae as it is sinking down to one corner allowing water to sit. For the time being they want it cleaning and have bought Sodium Hypochlorite. I intend on pressure washing first and applying with a watering can but what ratio do you use?

It is 15% strength. I am doing quite a big area, perhaps 20 feet square. Can anyone tell me how many chemicals to put in and how much water? I struggle with working things out. Am wearing chemical resistant gloves, goggles and a mask, Thank you
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Mike Halliday

  • Posts: 11581
Re: Sodium Hypochlorite
« Reply #1 on: March 06, 2022, 07:07:55 am »
Mix it 4 parts water to one part hypo in a watering can. Sprinkle it liberally  over the full patio taking care not to touch any fences or grass/plants. Leave it 20minutes then either apply more or rinse it off you can apply a stronger mix to any areas that need it
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Mike Halliday.  www.henryhalliday.co.uk

Lijong Tao

  • Posts: 5
Re: Sodium Hypochlorite
« Reply #2 on: March 07, 2022, 01:16:45 am »
Thanks for the reply, Mike. Much appreciated mate
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Darran Smith

  • Posts: 57
Re: Sodium Hypochlorite
« Reply #3 on: May 15, 2022, 11:32:02 am »
Mix with water and a bleach stable surfactant (not fairy) at 5% strength - that's 95 parts water to 4 parts Sodium Hypochlorite/1part bleach stable surfactant  - no need to go in any stronger - dwell 15 mins rinse/neutralise and then Pressure Wash - it will cut your time in half.
Repeat when required
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waterforce

  • Posts: 75
Re: Sodium Hypochlorite
« Reply #4 on: June 08, 2022, 07:35:43 am »
Quote from: Darran Smith on May 15, 2022, 11:32:02 am
Mix with water and a bleach stable surfactant (not fairy) at 5% strength - that's 95 parts water to 4 parts Sodium Hypochlorite/1part bleach stable surfactant  - no need to go in any stronger - dwell 15 mins rinse/neutralise and then Pressure Wash - it will cut your time in half.
Repeat when required
Maths was not your strong point then?
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Smudger

  • Posts: 13438
Re: Sodium Hypochlorite
« Reply #5 on: June 08, 2022, 05:01:06 pm »
 ;D ;D ;D
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Never argue with an idiot, they will only bring you down to their level, and beat you with experience

Splash & dash

  • Posts: 4364
Re: Sodium Hypochlorite
« Reply #6 on: June 08, 2022, 05:21:50 pm »
Quote from: waterforce on June 08, 2022, 07:35:43 am
Quote from: Darran Smith on May 15, 2022, 11:32:02 am
Mix with water and a bleach stable surfactant (not fairy) at 5% strength - that's 95 parts water to 4 parts Sodium Hypochlorite/1part bleach stable surfactant  - no need to go in any stronger - dwell 15 mins rinse/neutralise and then Pressure Wash - it will cut your time in half.
Repeat when required
Maths was not your strong point then?



I think he has accidentally put a 9 in front of the  5 hope his quotes are a bit more accurate 😂😂😂😂😂😂
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