Reef Central Online Community

Go Back   Reef Central Online Community > General Interest Forums > The Reef Chemistry Forum
Blogs FAQ Calendar Mark Forums Read

Notices

User Tag List

Reply
Thread Tools
Unread 10/29/2020, 01:53 PM   #1
PlantedReef
Registered Member
 
Join Date: Oct 2019
Location: Manchester, MO
Posts: 22
Need to start dosing

I've been noticing my Alk dropping over time regardless of water changes. I've already bought a dosing pump and BRS Kalkwasser and am dosing 1/2 saturation and at a way low dose. My alkalinity is consistently around 7.3 and my calcium is inconsistent (maybe just my testing). Last couple of weeks' results
10/11/20
Alk 8.6 Calc 480
10/14/20
Alk 7.6 Calc 430
10/15/20
Alk 7.4 Calc 440
10/16/20
Alk 7.4 Calc 450
10/17/20
Alk 8.2 Calc 410
10/20/20
Alk 7.8 Calc 460
10/21/20
Alk 7.8 Calc 470
10/23/20
Alk 7.8 Calc 420
10/28/20
Alk 7.3 Calc 450
10/29/20
Alk 7.8 Calc 440
The calculator says if I want to increase Alkalinity from 7.3 to 8.5 would take almost 54 ounces (1600ml) of saturated Kalkwasser solution. Dosing once per hour it would be about 60ml per hour. Does that sound correct? I've been trying to understand this for way too long so thought I would ask for special assistance. Thanks in advance


PlantedReef is offline   Reply With Quote
Unread 10/30/2020, 12:11 PM   #2
Alex114
Registered Member
 
Join Date: May 2019
Location: Northeast Ohio
Posts: 162
Did you write that down correctly? Your tank would have to be roughly 900 gallons to raise the alkalinity level from 7.3 to 8.5 according to the brs calculator. What size is your tank? Even at a half saturation 1600 ml still seems like a ton.

And I’ll run you through what I do for dosing using brs sodium bicarbonate and calcium chloride. I have a 75 gallon sps dominated tank. When I noticed my alkalinity dropping I started measuring it every two days. After a week I was able to figure out how much to dose daily so that it remained constant. My total system volume is about 85 gallons. My alkalinity drops about 0.6-0.7 daily which is roughly 80ml of brs sodium bicarbonate. So that is how much I dose each day. I’ve also found that if I want to raise my alk a significant amount, doing it over a period of a few weeks is best rather than all in one day. Also now that I know how much to dose each day I only measure about once a week and make adjustments if needed. Most of the time it remains constant


Alex114 is offline   Reply With Quote
Unread 10/31/2020, 08:35 PM   #3
Sk8r
RC Mod
 
Sk8r's Avatar
 
Join Date: Feb 2006
Location: Spokane WA
Posts: 34,628
Blog Entries: 55
If I need to adjust alk and cal I use buffer (Kent) and regular calcium over a number of days; THEN keep it there with kalk (Mrs Wages Pickling Lime). DO check your magnesium. !350 is a good reading. If it falls below 1200, your alk will go down, stubbornly so, no matter what you dose.


__________________
Sk8r

Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low.

Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.
Sk8r is offline   Reply With Quote
Unread 11/04/2020, 08:39 AM   #4
PlantedReef
Registered Member
 
Join Date: Oct 2019
Location: Manchester, MO
Posts: 22
Thank you both for replying! My tank is a 40 breeder with a 20 gallon sump. I have a ton of live rock so I just use 40g as my volume. Over the weekend, I was able to get my alk from 7.8dKH up to 9dKH using soda ash. I have a mixed reef with several soft corals, several hard corals, one fairly large sps (growing like a weed) and 3 small sps frags. Now, I'd like to keep my alk around 9dKH and my original post is my log of daily alk consumption (seems to sway for some reason in both directions). I'm going to say that its human error on the testing. I'm using Salifert test kits. What would you think a safe starting point would be for dosing BRS kalk (My kalk mix is 1tsp of BRS kalkwasser mixed with 5 quarts of RODI which I think is a fairly weak mix) and I am dosing 6ml/hour. Magnesium is typically around 1290ppm I dose Kent when it drops below 1300ppm. Thanks again I really appreciate the help.


PlantedReef 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



All times are GMT -6. The time now is 07:13 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 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 ©1999-2022
User Alert System provided by Advanced User Tagging v3.3.0 (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.