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 Catalina 250 Specific Forum
 Purge Freshwater System (no marine head)		  New Topic  Topic Locked
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Timkro
Deckhand

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USA
6 Posts
Initially Posted - 08/24/2023 :  14:51:38  Show Profile
I would like to permanently winterize the freshwater system. Am I stuck with using antifreeze or can it be purged completely?
Tim Kromholtz, Bayview, ID
2001 Catalina 250WK 2023
1978 Ranger 20 2005-2023

Voyager
Master Marine Consultant

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USA
5320 Posts
Response Posted - 08/24/2023 :  22:13:53  Show Profile
Tim, while I have a C25, I’m going to assume that your freshwater tank, sink drains, faucet pump handles and tubing are not fundamentally different than mine.

Unless you have a powered water pumping or pressurized system, you probably have a 6-9 gallon freshwater tank, plastic tubing between the tank and the faucets, stainless steel sinks, and plastic drain tubing that leads to proper through hull fittings.

If you can COMPLETELY empty your water tank, the hoses should not be difficult to blow out using compressed air or even your breath, and the drain hoses should drain completely if you disconnect both ends. As far as I know, the pump handles don’t hold water between uses, but you should pump them dry once you clear all the water from the tubing.

Once you’ve removed all the water from your freshwater system, you shouldn’t need any antifreeze ever again.

In my case, I drained my tank over 10 years ago, so I’m pretty sure that it’s empty. My galley sink is used to hold my keys, phone, and other paraphernalia. I have shortened the hose for my head sink so I can add a one gallon milk jug to supply it water, and place the jug in the cabinet underneath the sink for hand washing. I simply put the end of the hose into the jug and the pump faucet does the trick.

End of the season I simply remove and empty the jug, and pump the spigot dry. I blow out the drain hose with compressed air, and I’m done.

I tried to use the freshwater system years ago, but I could not defeat the algae and slime. Other folks have had much better luck using it.

I only use the one sink for hand washing, so I keep it simple. Drinking water is brought aboard from home using a 3-gallon insulated picnic jug that I fill with ice and keep a six pack of bottled water handy.
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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Voyager
Master Marine Consultant

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USA
5320 Posts
Response Posted - 08/24/2023 :  22:24:01  Show Profile
I should add the following warning. If you ever remove your drain hoses from the through hull fittings, always, always, always replace the hoses securely and use two stainless steel hose clamps to reinstall the drain hoses to the through hull fitting. I recommend two clamps because they are under the ship’s waterline. If it ever failed and the hose wiggled free then your boat will sink. That hose and the two hose clamps are all that separate you from disaster.

Now you could always close the through hull valve whenever you leave the boat, but I’m not sure how consistently everyone does that. You’d have to do it without fail. So a second hose clamp is cheap insurance.
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
Edited by - Voyager on 08/24/2023 22:25:53
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Timkro
Deckhand

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USA
6 Posts
Response Posted - 09/01/2023 :  16:13:45  Show Profile
Thank you Bruce for all the info. You've got me worried about the through hull fittings!
Tim Kromholtz, Bayview, ID
2001 Catalina 250WK 2023
1978 Ranger 20 2005-2023
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Voyager
Master Marine Consultant

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USA
5320 Posts
Response Posted - 09/02/2023 :  08:49:54  Show Profile
Hey Tim, I’m guessing that your through hulls are just fine, but it’s never a bad idea to double check them.
When you think about everything that can sink the boat, 8+ foot breaking waves over the gunwales are the scariest, hitting an iceberg is probably the most dramatic, and loose through hull fittings are the most insidious. Never knew what hit you!
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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Timkro
Deckhand

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USA
6 Posts
Response Posted - 09/03/2023 :  23:06:06  Show Profile
I was out this weekend having a wonderful likely end of season sail. The through hull drains are all above the waterline on my boat which sets my mind at ease a little bit. They are only 6 inches or so above so it's a good idea to make sure they're in good shape.
Tim Kromholtz, Bayview, ID
2001 Catalina 250WK 2023
1978 Ranger 20 2005-2023
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Dave Brown
Navigator

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USA
174 Posts
Response Posted - 10/20/2023 :  17:59:34  Show Profile
Tim,
I have not used the water system in our 250 , 1999 WK. for over 13 years.
We live in Nebr. so I filled it full of Antifreeze, then pumped it all out.
Never to be used agine. BUT ! I would caution you on the BLOW OUT thing.
How much pressure ? How much is to much ?
Don’t Assume, that one boat is similar To another boat, just because we’re on the same web page.
Older boats , sometimes are not made the same way newer boats are made.
From a 250 guy.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.