Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-07-2012, 16:24   #31
Registered User

Join Date: Sep 2010
Posts: 793
Re: Watermaker pre-filtration and sea water "quality"

Well, I'll be in those cold clear waters of Canada and Maine for the next month. Seawater temp is about 48 deg, up from 36 deg the other day.

I would never even try it in the ICW, Chesapeake, or Florida. They are just too shallow and silty. But a mile or two off the shore of Maine, Mass, and RI the water is pretty darn clear and I would hope I can find a reasonable way to use the watermaker there. I realize Long Island Sound was probably pushing it, as was Buzzards Bay.
__________________

__________________
twistedtree is offline   Reply With Quote
Old 09-07-2012, 19:10   #32
Registered User
 
settingsun's Avatar

Join Date: Oct 2009
Location: Traveling
Boat: 2008 Hunter 44DS
Posts: 143
Re: Watermaker pre-filtration and sea water "quality"

In the Sea of Cortez, Mexico, we could get 1800 gallons of water (30 hours) out of a pair of filters (20 micron followed by 5 micron). On mainland Pacific Mexico we could get as little as 240 gallons (4 hours) when there were remnants of a a red tide running despite going 15 miles out of our way offshore to avoid it...

We just look at the filters and when they are a dark green it's time to change them out.
__________________

__________________
s/v Groovy
Cruising full-time by sailboat and RV since 2007.
http://roadslesstraveled.us
settingsun is offline   Reply With Quote
Old 09-07-2012, 20:59   #33
Registered User

Join Date: May 2008
Posts: 1,971
Re: Watermaker pre-filtration and sea water "quality"

To my earlier comment, I have found that my Spectra fouls more quickly in coastal Maine (several miles offshore not up the rivers) than it does in southern NE waters or even farther south. The same thing happened to a friend. I don't understand it, Maybe someone here does.

Carl
__________________
CarlF is offline   Reply With Quote
Old 17-07-2012, 05:42   #34
Registered User

Join Date: Sep 2010
Posts: 793
After changing to a new filter and resetting the "clean filter" pressure, I got 6 hrs of run time before the filter plugged. I think the system is just working the way it is supposed to, and there is enough plankton and other life in the water to plug it up. Given this, I'm planning to add an additional 10u pre-filter to capture larger quantities of plankton (or whatever). Most watermakers seem to have this setup right from the factory, but not the Catalina, perhaps for cost saving reasons. I'd welcome advice on this addition. Here's what I'm thinking so far:

- 4x10 filter rather than a 2x10. A bigger filter will hold more crap before back pressure becomes excessive. That said, I need to look at the cost of the smaller vs larger filter elements to confirm it makes economic sense.

- 10u, and if I find it's still plugging too fast I might switch to 20u. I've been looking at the size of microscopic sea life and I think 20u or even 50u will catch it all, but I need to double check that.

After I add the filter I'll need to reset some of the control parameters, but i don't expect that to be a problem.

Any thought from them who knows?
__________________
twistedtree is offline   Reply With Quote
Old 17-07-2012, 11:36   #35
Registered User

Join Date: Feb 2008
Posts: 371
Re: Watermaker pre-filtration and sea water "quality"

I would go straight for the 20 micron. Filtration is not a linear function. A 20 micron pleated filter will become more efficient at collecting smaller particles as it operates until it ultimately plugs up. Then you can back-flush a few times with non-chlorinated fresh water or seawater before giving up completely. Our system came with 20 micron filters. They need changing about 5x more often than the 5 micron that follows. You can easily buy "Big Blue" 4inch x 10 inch pleated Watts filters on line for about $10 each. Check out Filterfast.com.
Chris
__________________
chrisjs is offline   Reply With Quote
Old 17-07-2012, 12:16   #36
Registered User

Join Date: Jun 2012
Posts: 307
This what we did at work, ours is a 350 Ton unit with 20 mic then 10 mic filtration. Over the last several years the algae blooms have gotten pretty bad causing super high filter consumption. We installed large basket strainers on the supply water and purchased a roll of 50 mic filter material from mcmaster Carr, it comes by the yard and is cheap. Just cut out a rectangle to fit inside of the basket. These are easily cleaned multiple times and re-used. I plan on a similar setup for my boat groco and others make nice SS basket strainers, you need a fairly decent sized one to compensate for the restriction.
__________________
Cruisingscotts is offline   Reply With Quote
Old 24-01-2014, 07:24   #37
Registered User

Join Date: Sep 2010
Posts: 793
Re: Watermaker pre-filtration and sea water "quality"

This problem persists. I'm now in the bahamas with crystal clear water and i still only get about 10hrs (130 gal) out of a 5u filter. I did install a 4x10 20u additional pre filter and reset the Clean Filter pressure on the MPC 5000.

This really isn't a very useable watermaker, and I have to believe the problem is specific to my system. I head of people running for 2-6 months on a set of filters, where i get only 10hrs? WTF?

When things plugged up yesterday I tried swapping only the big 20u filter to see what happened. There was no improvement in the boost pressure indicating that it's the 5u that's plugged, not the 20u.

Help?

Since is is an older thread, here's a reminder on the system.

Its a Spectra Catalina 300 MKII with MPC 5000 controller.
__________________
twistedtree is offline   Reply With Quote
Old 23-02-2015, 16:53   #38
Registered User

Join Date: Jun 2012
Posts: 307
Re: Watermaker pre-filtration and sea water "quality"

It's called Climate change, drastic changes in the amount of plankton and algae in the water everywhere. 5 microns is probably more than you need going in. If you use 20 micron followed by 10 or 5 micron you willowy likely get a 2 or 3 to one wash ratio on the 20's and having to change to 5 or 10.

At times in the Bering sea we are changing pre-filters every 10 to 15 min. Just because the water looks clear does not mean it is.


Sent from my iPhone using Cruisers Sailing Forum
__________________
Cruisingscotts is offline   Reply With Quote
Old 23-02-2015, 21:15   #39
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,833
Re: Watermaker pre-filtration and sea water "quality"

Quote:
Originally Posted by Badsanta View Post
Call stectra. I have talked to spectra owners and they would replace the filters with new and then clean the old. They would reuse them. and would have one clean and ready one in clean water and one dring and would just cycle them around
I've done exactly that for 15 years with my Spectra 180 with no problems.
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 23-02-2015, 21:23   #40
Senior Cruiser
 
senormechanico's Avatar

Cruisers Forum Supporter

Join Date: Aug 2003
Boat: Dragonfly 1000 trimaran
Posts: 5,833
Re: Watermaker pre-filtration and sea water "quality"

Quote:
Originally Posted by Tellie View Post
All you really need to do is to gently rinse off the surface with a little fresh water. Never scrub the filter, bleach it, or rinse it under high pressure from a hose nozzle. It will never be white again, but if changed soon enough, you should get 5-8 uses out of it before you throw it away.
I've been backflushing with a non chlorinated domestic water supply, alternating filters and laying the recently rinsed one in the sun for a few days. It seems to be working just fine.
My factory updated 180 makes about 8+ gallons per hour at around 100 ppm from battery voltage with no engine, only (maybe) solar input.

Am I going to hell for that?
__________________
Memento,homo, quia pulvis es, et in pulverem reverteris.
senormechanico is offline   Reply With Quote
Old 23-02-2015, 21:47   #41
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
Re: Watermaker pre-filtration and sea water "quality"

Use pleated filter elements. Then replace the filters and rig a line through the center of the dirty filters, tie it to the boat and throw the filters overboard for cleaning cycle. Back aboard I rinse with fresh. When they are very dirty, I add a little bleach to the bucket and soak them until clean and white. Then rinse and dry. They must dry completely because you need to get rid of the chlorine before re-installing them.

Pleated filters can be cleaned 3-5 times.
__________________
s/v Jedi is offline   Reply With Quote
Old 24-02-2015, 04:09   #42
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 7,963
Re: Watermaker pre-filtration and sea water "quality"

Quote:
Originally Posted by twistedtree View Post
This problem persists. I'm now in the bahamas with crystal clear water and i still only get about 10hrs (130 gal) out of a 5u filter. I did install a 4x10 20u additional pre filter and reset the Clean Filter pressure on the MPC 5000.

This really isn't a very useable watermaker, and I have to believe the problem is specific to my system. I head of people running for 2-6 months on a set of filters, where i get only 10hrs? WTF?

When things plugged up yesterday I tried swapping only the big 20u filter to see what happened. There was no improvement in the boost pressure indicating that it's the 5u that's plugged, not the 20u.

Help?

Since is is an older thread, here's a reminder on the system.

Its a Spectra Catalina 300 MKII with MPC 5000 controller.
Very unusual. I get a full season out of mine and have for 14 seasons now.

Dont like the idea of the single 5u on the newer Catalinas. My older Catalina 300, has three filter elements in line (50, 20, 5). Much more robust configuration. I've never had this configuration clog and shut down the system. The 50u pre filter is in a clear housing for easy inspection and is easy to access to clean/replace. I may have to clean/replace it once or twice in a whole season, but have never had to touch the finer downstream filters. I change all the filters for new each cruising season.

Also, the pressure sensors are very reliable but can get out of whack. I've had one go bad in 14 years. If you haven't already then test to make sure the pressure/vaccum they are reading is rational. A good old mechanical gauge or two in the system helps with this.

Could be a clog or obstruction somewhere that is causing higher vaccum and thus when the filter gets even a little dirty it throws an alarm. This sounds highly plausible to me.
__________________
belizesailor is online now   Reply With Quote
Old 24-02-2015, 07:46   #43
Marine Service Provider
 
SV THIRD DAY's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: La Paz, Mexico
Boat: 1978 Hudson Force 50 Ketch
Posts: 3,653
Re: Watermaker pre-filtration and sea water "quality"

Quote:
Originally Posted by Cruisingscotts View Post
It's called Climate change, drastic changes in the amount of plankton and algae in the water everywhere.
I've heard it all now...my kids even fried the Climate Change excuse when I asked them why no one took the trash out of the dinghy...
__________________
Rich Boren Goodbye Morro Bay...Hello La Paz, Mexico and the owner of:
Cruise RO Water High Output Water
Technautic CoolBlue Refrigeration
SV THIRD DAY is offline   Reply With Quote
Old 24-02-2015, 12:11   #44
Senior Cruiser
 
Therapy's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: W Florida
Boat: The Jon boat still, plus a 2007 SeaCat.
Posts: 6,894
Images: 4
Re: Watermaker pre-filtration and sea water "quality"

Quote:
Originally Posted by SV THIRD DAY View Post
I've heard it all now...my kids even fried the Climate Change excuse when I asked them why no one took the trash out of the dinghy...
GOOD ONE!
__________________
Who knows what is next.
Therapy is offline   Reply With Quote
Old 24-02-2015, 20:42   #45
Marine Service Provider
 
Scott Berg's Avatar

Join Date: Jul 2011
Location: Aboard
Boat: Seaton 60' Ketch
Posts: 959
Re: Watermaker pre-filtration and sea water "quality"

We use a 50u 4x10 pre filter followed by a 20u and a 5u
He big 50 really helps

We refuse paper filters after cleaning them... To clean we tow them behind us in clean ocean water then sun dry

Helps save on filters

S


Sent from my iPad using Cruisers Sailing Forum
__________________

__________________
Scott Berg
WAĜLSS
SV CHARDONNAY
Scott Berg is online now   Reply With Quote
Reply

Tags
water, watermaker

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 17:24.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.