I would use windscreen washer anti freeze as oppose to engine anti freeze or alternatively just dilute a significant amount of salt in the static water.
What type of toilet is it? I have a Jabsco which has a drain plug on the left hand side below the bowl and it is the work of seconds to open this and drain the bowl. Then just operate the pump with the inlet seacock closed and most of the water will be out of the system - at least any part that is liable to damage by freezing.
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Me ? I pour a half litre of antifreeze into bowl and pump out leaving small amount in bottom. Intake pump handle left up and in seacock open to allow water to drain out if boat is out of water. If boat in water then you have to drain pipe another way.
I do not use salt as that is corrosive.
Dunno if it is true or not, but the GreenBlue people say this:
"Never use detergents to deal with spills – it may disperse the fuel or oil and save you embarrassment, but they can be more toxic to aquatic life than the oil itself"
RE Ken McCulloch post above, this must also apply to any boat that has antifreeze in the raw-water cooling system of its engine at winter lay-up. This just gets pumped out at first engine start up unless you put a bucket under the outlet pipe to catch it.
If you had a slight spill of diesel or oil on water would you squirt a bit of fairy at it to disperse and get rid of it ?
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I'm not sure what beraing your question has on my observation about antifreeze. My understanding however is that it's marginally less harmful to allow the diesel/oil to disperse 'naturally'. The main ingredient of antifreeze is ethylene glycol which is toxic to most kinds of life and should not be discharged into any aquatic ecosystem.
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Dunno if it is true or not, but the GreenBlue people say this:
"Never use detergents to deal with spills – it may disperse the fuel or oil and save you embarrassment, but they can be more toxic to aquatic life than the oil itself"
Which was news to me......
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Tis true and exactly why I posed the question to other poster. And remember that a part of the detergent that makes it work is salt based.
If you had a slight spill of diesel or oil on water would you squirt a bit of fairy at it to disperse and get rid of it ?
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I'm not sure what beraing your question has on my observation about antifreeze. My understanding however is that it's marginally less harmful to allow the diesel/oil to disperse 'naturally'. The main ingredient of antifreeze is ethylene glycol which is toxic to most kinds of life and should not be discharged into any aquatic ecosystem.
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Reason I asked : many people think nothing of the squirt of fairy to break up that jot that spits out of exhaust or when drips refueling.
The aquatic potential damage as I'm told by my lab is possibly higher for the detergent than for the Glycol. Of course that is if you don't use environmentally friendly detergent.
I don't dispute the potential for aquatic damage, but what is the answer ? Consider already the damage being done by others on far bigger scale .. And how many boats will pump out into the water ? Mine usually is pumped onto the hard standing where my boats stands for winter - not into the water. Yes I could place a bucket - but then I'd probably only catch a small part of it given the ferocity of discharge from my exhaust.
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so what is the best method when the boat is in the water all year round.
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Apart from sucking all fluids out OR passing antifreeze through bucket to toilet to bucket using disconnected hoses ... ?? But considering the difficulty people have connecting the hoses and if been on for a few seasons !!
Any other method I'm not going to answer as I may incriminate myself.
As I understand it - it's not just the washing up liquid but also that you have dispersed the hydrocarbon fuel into the water, instead of it being held above the surface where it literally does no harm while it vapourises of.
It's only when an animal breaks through that film or it completely covers the waters surface that it does extensive damage. It starves oxygen etc. etc. and is poisonous.
Add fairy or e-wotsits and you are no longer looking at a film ... it's gone but where ?