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Drinking Water Conditioning

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tobo2 View Drop Down
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    Posted: 13 August 2019 at 14:13
As we get our new Hanse 508 by the end of this year we are thinking of the use of the water tanks  for drinking purposes as we are really tired of hauling aboard these masses of PET bottles every week. Reading an article in the German Yacht recently I was impressed by the UV-system "Double Blue" of Instant Trust Marine (www.instanttrust.com) . Does anybody have experiences in this field?

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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 13 August 2019 at 17:31
We have had a larger UV sterilization unit on a superyacht we ran which is fairly standard equipment on those vessels. We do not have a UV unit on our yacht. We liveaboard our yacht all year - cruise in summer and winter onboard. We usually desalinate water in summer when in the right places/conditions or take on town water through an activated charcoal filter. We check to TDS of town water before taking any on. In some places the TDS is too high so we desalinate instead. We haven't been worried about water being unsafe to drink. If the locals drink the water we drink it (after running through the charcoal filter). We tend to only desalinate in openwater areas or during transits, not in bay with lots of boats. We never buy bottled water. We find high TDS more of a problem which causes "lime scale" in the electric jug, coffee machine etc and also builds up in the water heater.
Wayne W
Cruising, currently in the Mediterranean but heading across the Atlantic early 2020
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tobo2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tobo2 Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2019 at 09:59
Dear Wayne

Thanks for the infos. As with the new Hanse 508 we will have 900 L of water we didn't plan to install a watermaker, meaning that we will be more dependant of marina or harbour water suppliers, doing coast sailing all the time. I also never heard of testing the TDS level. But I heard from our homeport marina in Kos - I think we met there last year - that the town is only supplying industrial water, so it is very important to use a filter unit (charcoal enough?) right at the tap before it even goes into the watertanks.

I wonder why Hanse is not offering a filter system as an option. This would be a really useful  "setting trends" alternative, as the watermaker is veeery expensive: 24'000, (230 V, 60 l/h), only offered with a generator, another 20'000 (!). I would hate running a gen only to produce water, especially at anchor in a bay.

Best regards
Thomas


Edited by tobo2 - 15 August 2019 at 10:26
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Wayne's World View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wayne's World Quote  Post ReplyReply Direct Link To This Post Posted: 15 August 2019 at 13:03
Thomas, 

Yes, I think we did meet in Kos in winter 2017-18. I agree it you are in the Med and have 900 litres of FW onboard you don't need a watermaker. We carried 840 litres but we will need the watermaker more when we get to the Caribbean and Pacific. Watermakers also like to be run so if we are motoring or motor sailing we often run the watermaker and any excess FW we use to wash down the boat. We recently fitted a Watt & Sea POD 600 and lithium batteries so if we are sailing at 7kn+ and running the POD we can also run the watermaker then as well. I check the output as we were sailing a few days ago and at 8.8kn we were getting up to 37amps output and about 26 amps at around 7.5kn which is a comfortable cruising speed without much stress. 
Wayne W
Cruising, currently in the Mediterranean but heading across the Atlantic early 2020
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