Reef Central Online Community
Marine Depot

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 > The Reef Chemistry Forum
Register Blogs FAQ Calendar Mark Forums Read

Notices

User Tag List

Reply
Thread Tools
Old 06/06/2019, 06:56 PM   #1
MHG
Registered Member
 
Join Date: Feb 2011
Posts: 2,968
Alk Supplement Turns to snow

Had a issue with my frag system with getting the calcium up, but getting the mag right seemed to fix that. But then my all started to drop. Now y calk is dropping again. When I does the all it instantly turns to particles and snows to the bottom of the tank. Calcium is dropping again.

PH is 8 (calibrated probe and Salifert test kit)
Alk has dropped from 9 to 5.5.
Calcium is dropping from 450 to 320 and dropping.


I have only three frags and I am dumping in the BRS soda ash solution to the tune of about 40 ml a day on a system where the total system volume is about 40 gallons.

Its only a few months old. Clearly its all just precipitating out and the levels just keep dropping.

Suggestions on how to stop the precipitation would be greatly appreciated.


__________________
MHG (LIRA Member)
60G Cube, Kessil 360's
MHG is offline   Reply With Quote
Old 06/06/2019, 10:59 PM   #2
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,899
It's fairly common for alkalinity supplements to cause temporary precipitation of magnesium hydroxide. Maybe the precipitate is redissolving over time?

If the precipitate seems to be permanent, I'd dose into the larger volume of water, which generally is the main tank, and not into a sump.

What is the magnesium level currently, and what products are you dosing? Dosing baking soda for alkalinity often helps with precipitation problems. How much are you dosing in one shot? You might need to dose something like 50 ppm of calcium per shot, and spread the doses out every 10-15 minutes or so for a bit.


__________________
Jonathan Bertoni
bertoni is offline   Reply With Quote
Old 06/07/2019, 09:28 AM   #3
BrettDS
Registered Member
 
Join Date: Feb 2012
Location: Orlando
Posts: 1,104
Alk Supplement Turns to snow

I wonder if there is a testing error or a bad test kit. Calcium and Alkalinity shouldn’t precipitate out at 9dkh and 450ppm, so I wonder if one or both levels is actually much higher than you think.

What test kits are you using? It might be worth getting another test kit or a standard solution just to verify.


BrettDS is online now   Reply With Quote
Old 06/07/2019, 04:36 PM   #4
Goss
Registered Member
 
Goss's Avatar
 
Join Date: May 2013
Location: Valley Center, Ca.
Posts: 225
Snow means you maxed out your calcium. I would get a new test kit.


Sent from my iPhone using Tapatalk


Goss is offline   Reply With Quote
Old 06/07/2019, 05:43 PM   #5
outssider
Registered Member
 
Join Date: Nov 2009
Location: Reseda, Ca.
Posts: 1,537
stop dosing carbonate and start dosing bicarbonate....and do it slowly...


__________________
Please don't feed the bears because the bears will become dependent on free handouts and forget how to take care of themselves …...

Current Tank Info: 75 Gal. Mixed reef
outssider is offline   Reply With Quote
Old Yesterday, 05:41 AM   #6
MHG
Registered Member
 
Join Date: Feb 2011
Posts: 2,968
Thanks for the input.


__________________
MHG (LIRA Member)
60G Cube, Kessil 360's
MHG 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 02:38 PM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 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 © 2019 DragonByte Technologies Ltd.