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Old 05-17-2020, 01:29 AM
NETWizz NETWizz is online now
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Retired Laboratory tech here... who never worked with anything as exciting or dangerous as COVID

Bleach is great, but you may be using it wrong.

Per the bottle it is 1/2 cup per gallon to sanitize hard surfaces. The Clorox website used to say 3/4 cup per gallon, but mostlikely that was 5.25% bleach though now most is 6% or even 7.5%

None the less we rounded up and used 1 cup per gallon, and I suggest this ratio personally even with higher concentration modern bleach... it is what I am using!

Write down 1/4 cup (2 oz) per quart. Put it in a spray bottle (labeled) and tune it to spray heavy droplets because a fine mist can be inhaled and chlorine is extremely lung irritating. This is because you don’t want to mix up a gallon at a time because mixed bleach does NOT have guaranteed effectiveness beyond 24 hours.

OUTDOORS, take shoes off and saturate soles until drenched with run-off that is dripping on the ground. Allow a full 10 minutes contact time minimum! Soles upside-down.

After this, I would spray them once more while still wet then bring them in a garage and allow to air dry overnight or until fully air dried.


Bleach sanitizer is good for only 24 hours after mixing per the CDC, Clorox, and EPA guidelines hence you want to use 2 ounces per day to make fresh and a 121 ounce jug should last 60 days. If you mix a full gallon, that would use a full cup per day, which is probably excessive.

Discard Old bleach in toilet, down drain, or dump into swimming pool. Bleach is just chlorine and when it breaks down in a pool it leaves only a trace of harmless salt.
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Old 05-17-2020, 05:49 PM
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Key take-away... If it doesn’t have a full 10 minutes contact time, it may not work.
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Old 05-18-2020, 11:58 PM
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Originally Posted by Colt View Post
This is why you test. Because overly simplified, overly cautious fool-proof advice handed out to lay people in the general public is just lazy on the part of officials setting the guidelines. In practice it's always really inefficient and wasteful. They're not buying the bleach or fighting for it in the aisles.

As a general rule: 2 ppm of Chlorine will take up to 4 and a half days or around 110 hours to evaporate. But conditions make a huge difference. That will not be the case in Denver with a shallow tray sitting in the sun on a hot summer day with a breeze. This is why you test.
You can test or you can keep adding bleach. For bio security in poultry houses, the recommendation is to just add bleach. I have no confidence in consumer or restaurant test strips. The results often do not make sense. The liquid or tablet tests are better. My local environmental health department will not accept test strips as a qualative measurement- They want to hear fresh solution was mixed daily.

Personally, Id just take the shoes off at the door.
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Old 05-29-2020, 04:43 AM
NETWizz NETWizz is online now
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You cannot accurately test bleach solutions generally speaking with strips... all you have available is pool supplies for your reagents.


You need at least 800 ppm for an effective surface sanitizer with bleach. Personally, I shoot for 3200 ppm which is 1 cup per gallon.

To test if you must take 1 part of your 3200 ppm solution and dilute with 99 parts distilled water making it 1%. Then verify 32 ppm. That said the test is accurate to 10%, so if you read 32 ppm you could have as little as 28.8 x 100

Anyway get 10 ml of your diluted solution. Mix a heaping scoup of FAS-DPD powder (amount not critical). It should turn pink.

Apply titrating reagent counting drops until clear. Each drop represents .5 ppm chlorine. Expect 64 drops.


Say it turns clear after 16 drops.... 16 * .5 = 8 ppm... 8*100 is 800 ppm. Your solution has 720 to 880 ppm free chlorine. Make damned sure you have no combined chlorine and that you are around 3000 ppm or better if you want to trust chlorine to kill the deadly zombie virus

Next you need to add another reagent to free combined chlorine to verify it is 0. If it is not the solution is bad if it turns slightly pink again.

Look up the Taylor swimming pool FAS-DPD test kits.


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All that said just mix fresh sanitizer daily. Bleach is cheap. Reagents are like $8 per ounce. Bleach is maybe $8 per gallon.
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Old 05-29-2020, 11:52 AM
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Originally Posted by NETWizz View Post
You cannot accurately test bleach solutions generally speaking with strips... all you have available is pool supplies for your reagents.


You need at least 800 ppm for an effective surface sanitizer with bleach. Personally, I shoot for 3200 ppm which is 1 cup per gallon.

To test if you must take 1 part of your 3200 ppm solution and dilute with 99 parts distilled water making it 1%. Then verify 32 ppm. That said the test is accurate to 10%, so if you read 32 ppm you could have as little as 28.8 x 100

Anyway get 10 ml of your diluted solution. Mix a heaping scoup of FAS-DPD powder (amount not critical). It should turn pink.

Apply titrating reagent counting drops until clear. Each drop represents .5 ppm chlorine. Expect 64 drops.


Say it turns clear after 16 drops.... 16 * .5 = 8 ppm... 8*100 is 800 ppm. Your solution has 720 to 880 ppm free chlorine. Make damned sure you have no combined chlorine and that you are around 3000 ppm or better if you want to trust chlorine to kill the deadly zombie virus

Next you need to add another reagent to free combined chlorine to verify it is 0. If it is not the solution is bad if it turns slightly pink again.

Look up the Taylor swimming pool FAS-DPD test kits.


*****


All that said just mix fresh sanitizer daily. Bleach is cheap. Reagents are like $8 per ounce. Bleach is maybe $8 per gallon.
Note, microbiologists would disagree. The legal max chlorine content ( under federal law and most states) for surface sanitization of food contact surfaces is 200 ppm. ( higher concentrations are allowed under some conditions if it is then washed off.)

Ive seen test strips work. We used to buy them in college at Walmart and verify the accuracy- they were them used to validate sanitizing solutions in some research project. I tested 25+ bottles ( in lots of 5) and never saw a bad one. But I have no confidence in the bottles at Walmart now. Ditto, the even cheaper one sold in restaurant supply stores.
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