Cryptosporidium how to clean water tanks?

[thinwater]

It’s chlorine resistant though, that’s the problem!

Resistant to the quantities they can use in drinking water (1-2 ppm) and short contact time (a few minutes) from the head works to the first customer. Not chlorine proof at the 20-40 time higher and long treatment times (8-24 hours) public health authorities recommend for sanitizing.

These two treatment schemes are literally 1000 times different. No one has said the cysts are chlorine-proof, only resistant to amounts you should drink.

 

[Trident]

Where are you going to discharge your several hundred litres of 5% hypochlorite? Whilst I appreciate that in the whole ocean it’s tiny quantity - we would all criticise any commercial operation that dirched

I'm not suggesting anyone do anything - the question was asked how to kill it and the answer I gave is how to kill it. I said for myself its not needed as I have a Seagull filter so can have ebola in my tanks and still drink it fine .

 

[thinwater]

I'm not suggesting anyone do anything - the question was asked how to kill it and the answer I gave is how to kill it. I said for myself its not needed as I have a Seagull filter so can have ebola in my tanks and still drink it fine .

Maybe. Maybe not.

Seagull filters are not rated as microbial purifiers. I've asked them why and they didn't have an answer. Check NSF listings (NSF ANSI 231). NSF Standards for Water Treatment Systems

Others do.

• NSF P231 Certified Water Filter | Carbon Block Technology
• Water 101: Decoding Water Filter Testing Claims | The Summit Register
• https://watersoftener-parts.com/SER...EK UF Drinking Water Cartridge Spec Sheet.pdf

The other thing to remember is that ANY filter can develop and internal leak, perhaps at a seal. If you suspect the water you should also chlorinate. Belt and suspenders.

Or just don't worry about it. WHO experiencing based on workers in the 3rd world says that water at their quarters is only a small part of their total exposure. Local food and drink. People. Air. You can't live in a bubble.

 

[Laysula]

Before you go to the trouble of cleaning tanks out see if you can get it tested first. Have a word with Martyn at the office he may well have a bit more clout than an individual regarding this.I also think that it's just higher Brixham which has been affected but sww are taking no chances.

Got to apologise. The guy on the boat in front of me was down last weekend and has had an upset tum all week, so it may well be in the marina pipework.

 

[oldbloke]

The other thing is the cryptosporidium is not Belgian Customs looking for signs of red diesel. I don't know the amont without looking it up, but you need quite a few (million?) to infect you so perfection in cleaning is not required

 

[AngusMcDoon]

The other thing is the cryptosporidium is not Belgian Customs looking for signs of red diesel. I don't know the amont without looking it up, but you need quite a few (million?) to infect you so perfection in cleaning is not required

2 to 10. That's individuals, not millions. It's a parasite, not a virus or bacterium.

 

[Beneteau381]

Yes its hard to kill - you can go 3% on hydrogen peroxide but still a lot - my tanks are 900L so an even bigger problem but swimming pool powdered chlorine will need considerably less than liquid bleach

In my case the Seagull filter protects from all so I'll just empty and fill the tanks a few times next time I get to a good supply and not worry much more than that.

My 40 gallon aft tank on my Bene here in Portugal was getting a bit musty so i dropped in half a cup of Portuguese household bleach and refilled. It was a very swimming pooly for the first half use, then a top up and its all smelling sweet now.
Very unscientific I know but hey ho!

 

[Beneteau381]

Where are you going to discharge your several hundred litres of 5% hypochlorite? Whilst I appreciate that in the whole ocean it’s tiny quantity - we would all criticise any commercial operation that dirched

https://cdnsciencepub.com/doi/pdf/1...ecomposes both to,and to oxjygen and chloride.

 

[Laysula]

The boil water notice has now been lifted for the Marina area. apparently most of Brixham was under it as a precaution but after extensive testing the water has been called safe to drink. There is still a restriction in higher brixham but that is nowhere near the marina.
Homepage | South West Water
Hopefully your tanks will be ok after all.

 

[howardclark]

I checked NOSS Marina postcode- where we are- with South West Water and the advice is still boil the water. I’ve got old water in the tanks any definitely not putting any more in until this is well over. Managing with bottled water until then

 

[mogmog2]

https://cdnsciencepub.com/doi/pdf/10.1139/v56-068#:~:text=Sodium hypochlorite decomposes both to,and to oxjygen and chloride.

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.

 

[ylop]

https://cdnsciencepub.com/doi/pdf/10.1139/v56-068#:~:text=Sodium hypochlorite decomposes both to,and to oxjygen and chloride.

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.

I have only partially skimmed the paper but it looked like they were decomposing bleach by heating it to 60 deg C for 24h… but if you had the ability to heat your water tank to that temp for that long you wouldn’t need the bleach!

 

[C08]

I have asked SWW for advice on cleaning out my two flexible tanks and the scientific dept are going to phone me back later today. I will be interested in their advice on this as there will be hundreds of boats in Brixham and Darmouth affected by this.

 

[Beneteau381]

I have only partially skimmed the paper but it looked like they were decomposing bleach by heating it to 60 deg C for 24h… but if you had the ability to heat your water tank to that temp for that long you wouldn’t need the bleach!

Seawater, composed of sodium, chlorine, oxygen and hydrogen. Bleach composed of sodium, chhlorine, hydrogen and oxygen. (at 5%) Hmm!

 

[Fr J Hackett]

Seawater, composed of sodium, chlorine, oxygen and hydrogen. Bleach composed of sodium, chhlorine, hydrogen and oxygen. (at 5%) Hmm!

You missed your chemistry lessons then.

 

[ylop]

Seawater, composed of sodium, chlorine, oxygen and hydrogen. Bleach composed of sodium, chhlorine, hydrogen and oxygen. (at 5%) Hmm!

Now I'm sure you are trolling... nobody is that ill informed are they?

 

[Fr J Hackett]

Now I'm sure you are trolling... nobody is that ill informed are they?

I wouldn't bet on it.

 

[lustyd]

nobody is that ill informed are they?

Plenty of people. I recall a chap near Portsmouth burning down a paediatrician's house in the early 2000's and spraying "Pedo" on their car. Apparently he'd been in the news for something and the article included his job title...

 

[ylop]

Plenty of people. I recall a chap near Portsmouth burning down a paediatrician's house in the early 2000's and spraying "Pedo" on their car. Apparently he'd been in the news for something and the article included his job title...

Sorry I should have said “nobody on here”

 

[Fr J Hackett]

Sorry I should have said “nobody on here”

I wouldn't bet on it.