Discussion in 'Pressure Washing' started by simon, Mar 28, 2016.
i was expecting all the black spots to go but the haven't
what was your mix and how long did you leave it before swilling down?
about 2inch in the bottom of a watering can & left for 25 mins
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!
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 ********.
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
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.
oh right, its deosan red label so i should of used a hell of a lot more eh lol
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%
I always got 11% - so a 5-6% mix gave really quick results for me.