Cruisers Forum
 


Join CruisersForum Today

Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 14-08-2019, 17:22   #1
Registered User

Join Date: Mar 2017
Posts: 12
TDS too high

Hello,

the TDS reading from our watermaker has always been >500ppm and sometimes up to 880ppm. Testing water from other sources with the same meter typically is <300ppm so it is assumed the meter is ok.

Lowering the flow rate does not seem to help the TDS. Every effort has been made to follow the manufacturers instructions.

Is there anything that can be done to improve the TDS eg. cleaning, acid wash, etc or are the membranes just not any good?

Thankyou
__________________

CosmicDrift is offline   Reply With Quote
Old 14-08-2019, 17:28   #2
Registered User
 
Captain Bill's Avatar

Join Date: Apr 2008
Location: Punta Gorda, Fl
Boat: Endeavourcat Sailcat 44
Posts: 2,769
Re: TDS too high

What kind of water maker?
__________________

Captain Bill is offline   Reply With Quote
Old 14-08-2019, 17:31   #3
Registered User

Join Date: Mar 2017
Posts: 12
Re: TDS too high

It is a H2OToGo 12v/20lph.
CosmicDrift is offline   Reply With Quote
Old 14-08-2019, 17:34   #4
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 29,946
TDS too high

We do need more info, but high TDS probably the membranes are shot.
Scaling etc that an acid wash helps decreases production rate but does little for TDS.
Except for maybe a bad O-ring in the membrane canister, I know of nothing that will drive TDS up,except membranes, many things will decrease production, but TDS being high is usually membranes.
Call the manufacturer and ask for their advice though first.

Iíve been wrong before
a64pilot is offline   Reply With Quote
Old 14-08-2019, 17:49   #5
Registered User
 
Captain Bill's Avatar

Join Date: Apr 2008
Location: Punta Gorda, Fl
Boat: Endeavourcat Sailcat 44
Posts: 2,769
Re: TDS too high

I couldn't find that unit on the internet, is it manual or automatic? What pressure do you run? What kind of pump does it use?
Captain Bill is offline   Reply With Quote
Old 14-08-2019, 17:51   #6
Registered User

Join Date: Nov 2015
Boat: R&C Leopard 40
Posts: 520
Re: TDS too high

As stated, it's the membrane unless something is contaminating it after the fact.
__________________
-Chris
FlyingScot is offline   Reply With Quote
Old 14-08-2019, 18:03   #7
Registered User

Join Date: Mar 2017
Posts: 12
Re: TDS too high

Quote:
Originally Posted by Captain Bill View Post
I couldn't find that unit on the internet, is it manual or automatic? What pressure do you run? What kind of pump does it use?
It is manual, runs at about 700psi, sometimes up to 800psi. The pump is a 12v Pumptec 80940
CosmicDrift is offline   Reply With Quote
Old 14-08-2019, 18:03   #8
Registered User

Join Date: Mar 2017
Posts: 12
Re: TDS too high

Thankyou everyone, I will try to check the o-rings.
CosmicDrift is offline   Reply With Quote
Old 14-08-2019, 18:04   #9
Registered User

Join Date: Mar 2017
Posts: 12
Re: TDS too high

Maybe H2Oonthego
CosmicDrift is offline   Reply With Quote
Old 14-08-2019, 18:20   #10
Registered User

Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 12,120
Re: TDS too high

You say its always been greater than 500 PPM, thats is a bit high in most cases if memberane is in good shape (regardless of make/model). Have you verified that with another porperly calibrated hand held meter? Maybe its a calibration issue. How old is the membrane?

800 is above levels recommended by WHO etc for regular human consumption.

If bad membrane, in my experience, cleaning may make a temporary difference, but its usually new membrane time.

Bad seals etc could cause pressure drops which would cause high PPMs. Do you have gauges in the system or anyway to test pressures at critical points?
belizesailor is offline   Reply With Quote
Old 14-08-2019, 18:38   #11
Registered User
 
Sailmonkey's Avatar

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 7,750
Re: TDS too high

Are you getting any air into the system while operating? That can increase salt pass through.
Sailmonkey is offline   Reply With Quote
Old 14-08-2019, 20:10   #12
Registered User

Join Date: Mar 2017
Posts: 12
Re: TDS too high

Quote:
Originally Posted by Captain Bill View Post
I couldn't find that unit on the internet, is it manual or automatic? What pressure do you run? What kind of pump does it use?
It is manual, runs at about 700psi, sometimes up to 800psi. The pump is a 12v Pumptec
CosmicDrift is offline   Reply With Quote
Old 14-08-2019, 20:13   #13
Registered User

Join Date: Mar 2017
Posts: 12
Re: TDS too high

Quote:
Originally Posted by Sailmonkey View Post
Are you getting any air into the system while operating? That can increase salt pass through.
Yes, air bubbles randomly appear in the flow meter
CosmicDrift is offline   Reply With Quote
Old 14-08-2019, 20:52   #14
Registered User

Join Date: Nov 2012
Location: La Honda, California
Boat: Beneteau Oceanis 50
Posts: 233
Re: TDS too high

I had high TDS and it was the o-rings in the canister as A64 suggested. Changing the canister o-rings is cheap. If you do change the o-rings, use silicon grease, not petroleum grease. Petroleum grease can cause premature failure of the o-rings and possibly contaminate the membrane.

Have fun.
Pitchondesign is offline   Reply With Quote
Old 14-08-2019, 21:07   #15
Registered User
 
Captain Bill's Avatar

Join Date: Apr 2008
Location: Punta Gorda, Fl
Boat: Endeavourcat Sailcat 44
Posts: 2,769
Re: TDS too high

My water maker is manual and I see much worse TDS readings when running below 800 and improved readings running at 900. I don't know what your pump and pressure vessel are rated for so I can't recommend that you run it at higher pressure but it may help if you can. Your membrane may well be old and that's all it can do in it's present condition.
__________________

Captain Bill is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sika 290i DC or TDS SIS-440 Orla Construction, Maintenance & Refit 4 01-03-2016 10:57
Water TDS safe limits? Dulcesuenos Plumbing Systems and Fixtures 22 01-01-2013 12:38
TDS Water Quality Tester silverp40 Plumbing Systems and Fixtures 15 03-10-2012 08:23
Water maker product TDS in Eastern Med svBeBe Europe & Mediterranean 3 02-10-2012 00:17

Advertise Here


All times are GMT -7. The time now is 23:48.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.