Cryptosporidium how to clean water tanks?

ylop said:
Now I'm sure you are trolling... nobody is that ill informed are they?
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What is salt composed of? NaCl sodium and chlorine,
What is water composed of? H2O hydrogen and oxygen,
What is bleach composed of? NaOCl sodium, oxygen and chlorine with hydrogen taking part in the initial manufacture, with water added to get the 5% strength

Sodium hypochlorite (NaOCl) is a solution made from reacting chlorine with a sodium hydroxide solution.

So what I said is technically correct.There are elements of Sodium, Hydrogen, Oxygen and Chlorine in both.
 
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Beneteau381 said:
What is salt composed of? NaCl sodium and chlorine,
What is water composed of? H2O hydrogen and oxygen,
What is bleach composed of? NaOCl sodium, oxygen and chlorine with hydrogen taking part in the initial manufacture, with water added to get the 5% strength

Sodium hypochlorite (NaOCl) is a solution made from reacting chlorine with a sodium hydroxide solution.

So what I said is technically correct.There are elements of Sodium, Hydrogen, Oxygen and Chlorine in both.
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Following your logic, Cyanide is a compound of three harmless elements. So you can dump as much as you like in the sea?
 
mogmog2 said:
AIUI bleach/hypochlorites are highly toxic to aquatic life and I read the abstract & summary and nothing jumped out of this that said otherwise. If you're able to translate into O level chemistry if they actually found it's now OK to discharge I'd be interested to hear as I would like to hit our (non crypytosporidium) tank with a shock dose of something that I can easily dispose of. Thanks.
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Just found this What Is Bleach and What Are Its Active Ingredients? | Clorox®

I made a very simple but true statement earlier on and have got hit by insults. I didnt make any claims at all.

Bit sad really but the bottom line according to the manufacturer of one of the worlds top selling bleach manufacturers is quite clear.
 
What about silver? Speaking with our son who is an engineer on some super yacht, he just took delivery of $30,000 worth of silver blocks to use in the fresh water system.
 
I use a mixture of hydrogen peroxide and silver as a bug killer in spray systems, and in my potable water tanks. It's made by Endosan (endosan.com) whom I have recommended on the forum previously.

I requested advice on Cryptosporidium from them as a source of info for anyone with a boat in the affected area.

Here it is.

EndoSan8 is indeed effective at eliminating Cryptosporidium, and I have included our comprehensive protocols for your reference.

To address your specific requirements, please adhere to the following guidelines:

  1. Shock Treatment at 500 PPM: Administer a shock dose of EndoSan8 at 500 parts per million (PPM) for a duration of 1 hour. This level of treatment is typically sufficient to resolve contamination issues. However, for enhanced efficacy, extending the contact time to 4 hours is advisable. This prolonged exposure can potentially yield superior results due to increased contact time with the contaminants.
  2. Enhanced Disinfection for Suspected Biofilm: If there is a suspicion of biofilm presence within the system, a more rigorous approach is necessary. Administer a shock dose of EndoSan8 at 2000 PPM and maintain this concentration for 8 hours. This high-level treatment ensures comprehensive disinfection by penetrating and breaking down the resilient biofilm matrix.
  3. Personal Protective Equipment (PPE) and Test Strips: Refer to the attached protocol document for detailed instructions on the appropriate PPE to be utilised during the disinfection process. The selection of test strips is crucial for accurate monitoring. You can conveniently purchase the necessary test strips from our online store at EndoSan Test Strips Online Store. The available options include:
    • 0-100 PPM Test Strips: Utilised for continuous dosing scenarios.
    • 0-1000 PPM Test Strips: Suitable for verifying a 500 PPM shock dose.
    • 0-5000 PPM Test Strips: Essential for monitoring high-level disinfection treatments aimed at biofilm removal.
  4. Ongoing Control with EndoSan8: If you choose to maintain ongoing disinfection, EndoSan8 can be utilised to control your system between 10-35 PPM. This concentration range is suitable for drinking water and is commonly employed by cruise ships to keep their systems disinfected until their next fill.
To determine the exact amount of EndoSan8 required for your specific system, including pipe volume, cold and hot water storage tanks, please use our online dosage calculator at EndoSan Dosage Calculator. This tool provides accurate dosage recommendations tailored to your system's specifications.

Adhering to these protocols will ensure the effective disinfection of your boat’s water system, providing safe and clean water. Should you require further assistance or clarification, please do not hesitate to contact us.


I have no connection with Endosan except as a very satisfied, commercially qualified, user for agricultural spraying, and privately for the boat for many years . This is posted as it provides one answer to the OP's question about Cryptosporidium.
 
chris-s said:
What about silver? Speaking with our son who is an engineer on some super yacht, he just took delivery of $30,000 worth of silver blocks to use in the fresh water system.
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Silver is good, we use a Brita filter jug on board, use water from the pontoon passed thru it for drinking. It contains activated charcoal and silver I understand
 
penberth3 said:
Following your logic, Cyanide is a compound of three harmless elements. So you can dump as much as you like in the sea?
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I didn’t do any logic, just presented facts about the composition of bleach and seawater. Any logic was assumed in the brains of those who were quick to make insults about me. Anyway, who in this world would use cyanide to disinfect water tanks? 😂
 
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Hydrogen peroxide changes to plain H2O very very rapidly when poured into the ocean. See my post #49 about a product that works without slaughtering human beings or orcas.
 
Beneteau381 said:
Well you got it wrong 😉 wouldn’t go amiss.
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It's been a little under 50 years since I finished my post doctoral work and closer to 40 since I actually worked in a lab on a bench but the basics I learned 60 years ago are still fresh enough to know that what you posted was empirically correct but practically bollocks. The problem with making statements like you have and viago is a past master at is that some people are going to believe you bollocks and act on it with potentially unpleasant consequences.
 
Mister E said:
So what can be used and pumped overboard into the sea?
Can I use endosan?

Please consider what the water companies are pumping out when giving replies.
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What are you trying to kill? What concentration are you planning to add? The problem with the bleach wasn’t so much the fact some would end up in the sea - it was the amount. The quoted concentration was 5% - that’s the sort of concentration in typical thin household bleach. So basically fill your tanks with hundreds of litres of bleach and no plan for disposal. All for a parasite that can be physically flushed out!

Now if you were looking to treat mould/bacteria that is clinging to tank walls, pipework etc then it’s much more susceptible to chlorine and doesn’t need 5%. Personally I’d use Milton (or a cheaper equivalent) that is intended for sterilising baby bottles as it’s doesn’t seem to have the taste/smell of traditional bleach. I suspect if you asked your marina they would not approve of you dumping 200L of dilute Milton in their water either. Given you’ll want a bit of contact time and probably some agitation - fill tanks go for sail, drain tanks slowly, return to port and fill with fresh water and it’s not going to kill any fish.

You could ask the manufacturer how dilute Endosan should be before discharge to drain.
 
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