Reef Central Online Community

Home Forum Here you can view your subscribed threads, work with private messages and edit your profile and preferences View New Posts View Today's Posts

Find other members Frequently Asked Questions Search Reefkeeping ...an online magazine for marine aquarists Support our sponsors and mention Reef Central

Go Back   Reef Central Online Community > General Interest Forums > Reef Discussion
Register Blogs FAQ Calendar Mark Forums Read

Notices

User Tag List

Reply
Thread Tools
Old 12/09/2017, 10:44 AM   #1
PingG25
Registered Member
 
Join Date: Dec 2014
Location: Rugby
Posts: 42
Red Sea Mg Ca Kh frustration

Iíve been using this test kit for the last couple of weeks and I really do find it inconsistent in results and very fiddly to use. The Mg Iíve followed to the rule. 15 secs between drops, 1 minute for the 5 drops getting a result of 1500. Re do the test but for 20 secs and I get a different result, this time 1400. When I compare to the likes of JBL and Salifert itís always 50:60 points higher. Ca not quite so bad but is always 25 lower than Salifert and 40 higher than JBL. KH I have to run 3 tests as this also is inconsistent by giving high results. I have to do 3 tests for each just to get a repeat result. Very disappointing!!!!! and is affecting my dosing regime because the results cannot be relied upon. Does anyone else have this experience.


Sent from my iPhone using Tapatalk


PingG25 is offline   Reply With Quote
Old 12/09/2017, 04:46 PM   #2
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,331
Moved to this forum as more on topic here. I can move it to the Chemistry Forum if that works better.


__________________
Jonathan Bertoni
bertoni is online now   Reply With Quote
Old 12/10/2017, 08:56 AM   #3
braappn
Registered Member
 
Join Date: May 2014
Location: Colorado
Posts: 19
I notice some inconsistency with my alk test. The first test often reads a higher alk than subsequent tests. This test procedure is very simple so there must be an explanation. I wonder if something in the tiny amount of residual water in the vial is affecting the test results. I do rinse the vial very well with rodi after each test but then put the vial away wet.

The way you describe your mg results, well it makes sense that you change the test procedure and it produces different results. But the alk test is so straightforward that the inconsistency is strange to me as well.


Sent from my iPhone using Tapatalk


braappn is offline   Reply With Quote
Old 12/10/2017, 10:42 AM   #4
JordyRoo
Registered Member
 
Join Date: Oct 2017
Location: Shropshire, UK
Posts: 38
i dont have a problem with my, consistant results with my hanna checker.


JordyRoo is offline   Reply With Quote
Old 12/10/2017, 10:42 AM   #5
JordyRoo
Registered Member
 
Join Date: Oct 2017
Location: Shropshire, UK
Posts: 38
Quote:
Originally Posted by JordyRoo View Post
i dont have a problem with my, consistant results with my hanna checker.
mine*


JordyRoo is offline   Reply With Quote
Old 12/12/2017, 12:20 PM   #6
PingG25
Registered Member
 
Join Date: Dec 2014
Location: Rugby
Posts: 42
Quote:
Originally Posted by braappn View Post
I notice some inconsistency with my alk test. The first test often reads a higher alk than subsequent tests. This test procedure is very simple so there must be an explanation. I wonder if something in the tiny amount of residual water in the vial is affecting the test results. I do rinse the vial very well with rodi after each test but then put the vial away wet.

The way you describe your mg results, well it makes sense that you change the test procedure and it produces different results. But the alk test is so straightforward that the inconsistency is strange to me as well.


Sent from my iPhone using Tapatalk


Iíve extended the 15 sec mix on MG1 to 30 sec mix and interestingly Iím getting lower results that now make sense. On the face of it, it looks like the mixing isnít long enough to dissolve and mix the ingredients. The Red Sea is now lower than Salifert by 30 points.


Sent from my iPhone using Tapatalk


PingG25 is offline   Reply With Quote
Old 12/12/2017, 12:20 PM   #7
PingG25
Registered Member
 
Join Date: Dec 2014
Location: Rugby
Posts: 42
Quote:
Originally Posted by JordyRoo View Post
mine*


I didnít think you could get a Hanna checker for Mg?


Sent from my iPhone using Tapatalk


PingG25 is offline   Reply With Quote
Old 12/12/2017, 02:40 PM   #8
saltwater_wannabe
Registered Member
 
saltwater_wannabe's Avatar
 
Join Date: Feb 2004
Location: Cary, NC
Posts: 63
Check with Red Sea, my LFS reported the same problem and found there was a 'bad batch' at some point and they sent new kits free of charge. You do need to locate the lot numbers on the bottles for their info.


saltwater_wannabe is offline   Reply With Quote
Old 12/12/2017, 02:46 PM   #9
der_wille_zur_macht
Team RC Member
 
der_wille_zur_macht's Avatar
 
Join Date: Sep 2003
Location: NY
Posts: 17,749
Hold on. If you're frustrated with this brand of kit, and you have other brands available (since you listed testing against them), why not just toss these and use the other ones? Why continue to troubleshoot?


__________________
Inconveniencing marine life since 1992

"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
der_wille_zur_macht is offline   Reply With Quote
Old 12/12/2017, 03:21 PM   #10
PingG25
Registered Member
 
Join Date: Dec 2014
Location: Rugby
Posts: 42
My problem was trying to select the test kit that provided the most accurate result. With such a big gap between kits itís difficult to understand which one is correct .


Sent from my iPhone using Tapatalk


PingG25 is offline   Reply With Quote
Old 12/12/2017, 03:50 PM   #11
der_wille_zur_macht
Team RC Member
 
der_wille_zur_macht's Avatar
 
Join Date: Sep 2003
Location: NY
Posts: 17,749
I don't think absolute value accuracy is the most important thing for these parameters. Mg at 1400 versus 1450 isn't going to change anything. Consistency and ease of use are definitely more important. I'd pick the kit you find easiest to get reproducible results with.


__________________
Inconveniencing marine life since 1992

"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
der_wille_zur_macht is offline   Reply With Quote
Old 12/13/2017, 05:21 PM   #12
rjjr1963
Registered Member
 
rjjr1963's Avatar
 
Join Date: Dec 2015
Location: Nebraska/Missouri
Posts: 719
Make sure your chemicals are not out of date. My Hannah Alk checker was giving me goofy readings and the chemical fluid was only 1 month out of date.


__________________
72x24x16 115 gallon under construction

Current Tank Info: 40 gallon reef
rjjr1963 is offline   Reply With Quote
Reply

Thread Tools

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 On

Forum Jump


All times are GMT -6. The time now is 07:16 PM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Use of this web site is subject to the terms and conditions described in the user agreement.
Reef CentralTM Reef Central, LLC. Copyright ©1999-2014
User Alert System provided by Advanced User Tagging v3.3.0 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.