was my hypo to weak

Discussion in 'Pressure Washing' started by simon, Mar 28, 2016.

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  1. simon

    simon Guru
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    i was expecting all the black spots to go but the haven't before 1.jpg after 1.jpg before 2.jpg after 2.jpg
     
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  2. padman

    padman Active Member
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    what was your mix and how long did you leave it before swilling down?
     
  3. simon

    simon Guru
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    about 2inch in the bottom of a watering can & left for 25 mins
     
  4. Njones

    Njones Well-Known Member
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    Way too weak. I mix hypo 50:50 & see results starting to appear in less that 2 mins - that might be overkill, but it does a great job!
     
  5. sllab

    sllab Active Member
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    Telling people to use a 50:50 mix doesn't help anyone because it is often purchased in different strengths from 8%-15%.

    I would say for those paths you want about a 7-8% mix (or 70k-80k parts per million). You might have to apply and leave for a while then re-apply to any really stubborn ********.
     
  6. simon

    simon Guru
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    so at 8% to 5 ltrs of water that would mean 400ml of hypo i think, which seems even less than the amount i used
     
  7. sllab

    sllab Active Member
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    No, You need to find out what strength hypo you have. for example:

    This is 10-11% so to get to 7% you would use 2 parts hypo from the container to 1 part water
    Deosan RedLabel Hypo AG311 20L | Diversey Direct

    This is 14% so to get to 7% you would use 1 part hypo to 1 part water.
    Sodium Hypochlorite 14% 1L including delivery: Amazon.co.uk: Office Products.

    It doesn't arrive at 100% Sodium Hypochlorite it usually starts at between 8-15% in the bottle or drum you buy. i.e. it is already watered down you just need to water it down more to make it go further and make it easier to work with.
     
  8. simon

    simon Guru
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    oh right, its deosan red label so i should of used a hell of a lot more eh lol
     
  9. sllab

    sllab Active Member
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    yeah 2 parts hypo 1 part water I would say. seems to do the trick for me. And if you have any tough spots just hit them with it at the full 11%
     
  10. Njones

    Njones Well-Known Member
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    I always got 11% - so a 5-6% mix gave really quick results for me.
     
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