Watermaker Membranes - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 


Like Tree1Likes
  • 1 Post By RichH
Reply
 
LinkBack Thread Tools
  #1  
Old 09-13-2012
sww914's Avatar
Aspiring to be a Mexican
 
Join Date: Oct 2008
Location: La Cruz de Hunacaxtle, Mexico
Posts: 543
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 6
sww914 is on a distinguished road
Watermaker Membranes

I bought a used watermaker on CF cheap, a System 9. It certainly will need new membranes, even if they were pickled, after 8 years of disuse. Is there any competition for the Dow Filmtec SW30-2540? It's the only 2.5" X 40" saltwater membrane that I've found. American RO seems to have the best price at $180.00 each, have you seen any better prices?

Later I'll detail the installation on our blog.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #2  
Old 09-13-2012
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,881
Thanks: 9
Thanked 77 Times in 70 Posts
Rep Power: 15
RichH will become famous soon enough
Re: Watermaker Membranes

$175-180 is a typical 'good' price for a 2.5ōX40 SW membrane.

My usual supplier for SW membranes is: Midwest RO Reverse Osmosis and Water Filters and Membranes in Illinois

Dow Filmtec is the worlds largest manufacturer of spiral wound RO membranes. There are cheapy asian membranes but their history is of great variability of the retention, etc. Hollow fiber bundled RO system 'membranes' are another possibility but much greater in $$ than the Filmtec.

Go to the filmtec website and download: "RO membrane regeneration and restoration", if you have that level technical/chemical ability and a good TDS meter to verify your 'regen'. Depending on the actual membrane, you may have to 're-start' them using glycerine to accomplish the 'wet out' if they are polysulfone (non-filmtec) instead of polyamide.
Bene505 likes this.
Reply With Quote Share with Facebook
  #3  
Old 06-18-2013
Captainmeme's Avatar
Senior Member
 
Join Date: Aug 2008
Location: East Tennessee
Posts: 776
Thanks: 4
Thanked 15 Times in 14 Posts
Rep Power: 7
Captainmeme is on a distinguished road
Re: Watermaker Membranes

Dow has some low pressure membranes, 100 psig, that are speced to remove 99% of the salt when the temp is 77F and the salt content is 500 ppm. Ocean water is 32000
ppm. Would the membrane be damaged if it is exposed to feed water that contains more than 500 ppm of salt? Is it possible to put two of these low pressure membranes in series to make drinkable water?
__________________
No such thing as a free cat, and that goes for boats as well.
Nor'sea 27
Reply With Quote Share with Facebook
  #4  
Old 06-19-2013
mitiempo's Avatar
Senior Member
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,155
Thanks: 0
Thanked 71 Times in 62 Posts
Rep Power: 8
mitiempo will become famous soon enough mitiempo will become famous soon enough
Re: Watermaker Membranes

Quote:
Originally Posted by Captainmeme View Post
Dow has some low pressure membranes, 100 psig, that are speced to remove 99% of the salt when the temp is 77F and the salt content is 500 ppm. Ocean water is 32000
ppm. Would the membrane be damaged if it is exposed to feed water that contains more than 500 ppm of salt? Is it possible to put two of these low pressure membranes in series to make drinkable water?
The membrane wouldn't be damaged but the product will be salty. Those are I believe the membranes for home use to purify tap water, not for producing fresh drinking water from salt. 2 in series will still give salty product.
__________________
Brian
Living aboard in Victoria Harbour
Reply With Quote Share with Facebook
  #5  
Old 06-19-2013
SimonV's Avatar
Wish I never found SN!
 
Join Date: Jul 2006
Location: Brisbane Australia
Posts: 1,996
Thanks: 3
Thanked 4 Times in 4 Posts
Rep Power: 9
SimonV will become famous soon enough
Re: Watermaker Membranes

I just put new membranes in my katadyn power survivor 80e 2 membranes total $700 expensive but the ppm is now 120 to 128ppm. The ones I replaces started to fail quite quick, one month of use went from 580ppm to 920ppm when I pulled them they were deformed and well down on their diameter compaired to the new ones. not bad for 6 years continuous daily use.(2-3 hours) and never pickled.
__________________
Simon
Ericson 39B.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

I love my boat
S/V GOODONYA
Brisbane
present location Heading to the Whitesundays

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

DELIVERY SKIPPER
Drinking Rum before 10am makes you a Pirate NOT an alcohlic
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
PRO Watermaker captden Gear & Maintenance 7 12-04-2010 08:06 PM
Watermaker mparent Gear & Maintenance 3 07-10-2009 03:40 PM
watermaker kennyarmes Gear & Maintenance 30 02-05-2009 02:59 PM
watermaker oysterbay2 Cruising & Liveaboard Forum 19 01-18-2008 07:39 AM
Watermaker???? wildcard Gear & Maintenance 2 11-26-2006 09:32 PM


All times are GMT -4. The time now is 06:27 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.