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JTL
08/13/2017, 03:27 PM
Who still does weekly WC's? I still do, about 10% but maybe that is too frequent. Maybe some don't do them at all. I think about my swimming pool and spa. It never gets drained completely, but I do add top off water to handle the evaporation. I think through dosing we can replenish all of the depleted elements, but isn't doing a 10% WC better? Maybe not. For me doing 10% weekly, is about 2.5 boxes of salt per year. Certainly not cost prohibitive, especially if I don't have to purchase a bunch of supplements. The downside is maybe adding that much new water on a weekly basis is shocking the system and doing harm.

It will be interesting to hear what you reefers do and why and how it is working.

Vinny Kreyling
08/13/2017, 03:47 PM
Mine works out to about 25% a month.
That is what was recommended back when I started & I just kept it that way.

JTL
08/13/2017, 04:02 PM
Mine works out to about 25% a month.
That is what was recommended back when I started & I just kept it that way.

Do you do it monthly or more frequent?

Vinny Kreyling
08/13/2017, 06:30 PM
Weekly 15 gallons.

Cheapreef
08/13/2017, 06:51 PM
Weekly 12% for me, just how it works out for my mix bucket.

SkyReef
08/13/2017, 06:51 PM
I use an automated-water-change system, powered by a dual-head Masterflex pump. It automatically exchanges 1 gallon of spent saltwater with 1 gallon of new saltwater every day. This amounts to a 30% water change per month. Love it.

andywar
08/13/2017, 09:57 PM
I use an automated-water-change system, powered by a dual-head Masterflex pump. It automatically exchanges 1 gallon of spent saltwater with 1 gallon of new saltwater every day. This amounts to a 30% water change per month. Love it.Can you please share the brand and components? Thanks in advance!

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djbon
08/13/2017, 10:01 PM
Never did on purpose, almost 4 years now.

RobZilla04
08/14/2017, 06:29 AM
15% every 5 weeks or so.

JTL
08/14/2017, 06:39 AM
Quite a range but it appears that I may be on the high side at 40% per month so perhaps I will scale it back.

Bpb
08/14/2017, 06:50 AM
12% a week for me also. No water changes is the current flavor of the week. I won't be joining. Nor would I unless I had a very large tank. I've attempted it before and my corals didn't respond well. Regardless of what anyone says on paper, the eye test is the ultimate determining factor. My tank did poorly without them, and flourishes with them. So I will keep doing water changes.


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RobZilla04
08/14/2017, 07:08 AM
Quite a range but it appears that I may be on the high side at 40% per month so perhaps I will scale it back.

Wow! If you are testing frequently you can better gauge how often you need nutrient replenishment/dilution via water changes.

JTL
08/14/2017, 07:50 AM
I use an automated-water-change system, powered by a dual-head Masterflex pump. It automatically exchanges 1 gallon of spent saltwater with 1 gallon of new saltwater every day. This amounts to a 30% water change per month. Love it.

Isn't that more like 40% per month and are you allowing for rock and sand?

JTL
08/14/2017, 08:06 AM
Wow! If you are testing frequently you can better gauge how often you need nutrient replenishment/dilution via water changes.

It is on the aggressive side but I am obviously not the only one. I have a 150g system counting the sump but I figure the net water volume is approx 100g. Unfortunately there are some nutrients that are not normally tested, like strontium and potassium, trace elements and vitamins. At least I don't have the kits. IO recommends 20% wc every 2 weeks, but they also sell salt mix:)

SkyReef
08/14/2017, 07:18 PM
Can you please share the brand and components? Thanks in advance!

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So I am using a Masterflex pump with a dual head; 1 line pulls spent water, and the other pushes clean water. Simultaneously. Here is a link to an entire thread on the subject. It is awesome!


http://www.reefcentral.com/forums/showthread.php?t=2349824

Good luck!

SkyReef
08/14/2017, 07:21 PM
Isn't that more like 40% per month and are you allowing for rock and sand?

You might be right. I upgraded my tank to an 80-gallon, and with the sump and volume deduction for live rock, I was estimating 100 gallons total. The automated water change system is not 100% efficient in that a very small amount of new water gets changed. But it's a negligible effect.

homer1475
08/15/2017, 05:32 AM
Quite a range but it appears that I may be on the high side at 40% per month so perhaps I will scale it back.

How is that on the high side? 40% a month = 10% a week. 10% a week is whats typically referred to when starting out as a newbie.

On my 80G total water volume(80G display + 30G sump - displacement = roughly 80G), I do 10G weekly WC's which is just slightly above 10%.

RobZilla04
08/15/2017, 06:42 AM
I still think that the general rule for WC's (10% / Week) is good for noobs. We were all there once. After one gets a good grasp of testing, tank maintenance, and nutrient swings (both good and nuisance) adjustments can be made to frequency and volume of WC's.

Look at the range of responses as evidence. Some do none. Some still do them weekly after 10+ years.

JTL
08/15/2017, 07:02 AM
I still think that the general rule for WC's (10% / Week) is good for noobs. We were all there once. After one gets a good grasp of testing, tank maintenance, and nutrient swings (both good and nuisance) adjustments can be made to frequency and volume of WC's.

Look at the range of responses as evidence. Some do none. Some still do them weekly after 10+ years.

1st sw tank was in 1985 and many more since then. Am I considered a newbie? I did take a few years off, so maybe. I think conventional wisdom is that water changes are good but amount and frequency is debatable. I have always been in the 10% per week camp for the simple reason it works for me and since most of my water volume has been about 100g, the effort and cost is minimal.

djbon
08/15/2017, 07:22 AM
For me, everything boils down to cost. I don't have a thick wallet but I like this hobby very much. I will try my very best to run a tank successfully without burning a hole on my pocket. In my place, salt is quite expensive and a regular WC is costly. For some, money is not an issue, but for me throwing salt water down the drain is painful. Fortunately my tank has reached maturity and still surviving on old IO saltwater I mixed more than 3 years ago.

ktownhero
08/15/2017, 07:42 AM
I change 5 gallons per week in my 112 gallon system. Actual water volume is only about 80g so it's roughly an 8% wc. I will occasionally skip a week or two though.

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cincyjim
08/15/2017, 09:21 AM
I change 2 gallons a day on a continuous water change system. I'm close to the 10% per week/month for my tank.

tmz
08/18/2017, 01:35 PM
1% daily

Big E
08/20/2017, 02:08 AM
Fyi,water changes aren't linear when you're projecting what you get for a month from a daily or weekly water change......for accurate numbers this calculator will do the math for you.

https://www.hamzasreef.com/Contents/Calculators/EffectiveWaterChange.php

Timfish
08/20/2017, 06:35 AM
This system (http://reefcentral.com/forums/showthread.php?t=2601390&highlight=skimmerless) started 20 years ago gets 7% weekly

tmz
08/20/2017, 09:31 AM
Thanks for the calculator Ed.

I do small daily water changes even though the removal rate is less efficient than larger less frequent changes( per the calculator, in my case a 30 gallon per month water change on the 700 gallon system would remove 210 gallons while the daily 1% routine removes 184 gallons over the course of 30 days ) .

So, I'd get 26 gallons of additional removal with a once a month routine.

However, there are two primary reasons I do water changes:

1. Replacement of depletion of major minor and trace elements in away that supports constancy. There is no loss in the replacement as 30 gallons of new water with these elements are added over 30 days and added slowly affording more constancy to the system.

2 . Removal of buildups of some elements drawing them back to the baseline ratios of the salt mix as well as organic matter and nutrients again in a way that promotes constancy.Though , 26 less gallons are removed with the daily 1% change vs the 30 day routine; IMO, it's less important than the constancy advantage from smaller more frequent additions as a maintenance routine. If the objective in a given case was a major nutrient , toxin or element reduction a larger change would be more efficient.

Ron Reefman
08/24/2017, 04:52 AM
I agree that water changes are a good thing, but with a well designed system using natural cleaners rather than reactors, a lower number may be just fine.

My system is a 125g DT with lots of coral and some smallish fish and lots of other bio diversity (serpent stars, sea cucumbers, porcelain crabs, emerald crabs, various snails, anemones, feather dusters, sponges). I have a 50g cube with macro algae (not chaeto) and a 45g sump with 3 filter socks and a good skimmer. The entire system added together is about 200g and I have about 150 lbs of live rock. I think I add some of the trace elements by feeding a very wide variety of foods and even some simple additives for corals.

Over the past year I've done roughly 125g in water changes. Usually 20 or 25g at a time so 5 or 6 changes in total. I did more early on and less now that the tanks are established and mature.

tmz
08/24/2017, 09:20 AM
Hello Ron,

My system is a bit larger but similar in diversity and maturity . For perspecitve , the changes I do work out to about 30% per month in total ; yours are about 5% per month. I don't use any trace or minor element additives though. I agree that there is no clearly defined optimal volume for water changes and it may vary from system to system. My thinking and practice takes me toward the high but slow norm but less might be sufficient.

bonnie.klassen1
08/27/2017, 10:46 PM
I use an automated-water-change system, powered by a dual-head Masterflex pump. It automatically exchanges 1 gallon of spent saltwater with 1 gallon of new saltwater every day. This amounts to a 30% water change per month. Love it.



Would love more info on how this works. I love when things are automated!!!

bonnie.klassen1
08/27/2017, 10:47 PM
Does everyone generally do weekly water changes or monthly? What's your schedule?

minus9
08/27/2017, 11:09 PM
I do roughly 20% every week (Sunday) in my 22g sps nano. This gives me the opportunity to clean out the back chamber of detritus, remove chaeto growth, etc... In the past I did bi-weekly changes (10% - 15%), but those tanks were mostly mixed reefs and FOWLR.
For my new 90g that I'm setting up now, I'll probably use the genesis renew system (at some point), but I'll probably go back to bi-weekly changes of 10% - 15% until I buy the genesis.

SkyReef
08/28/2017, 06:49 PM
Would love more info on how this works. I love when things are automated!!!

Hi, Bonnie:

As stated in Post No. 15 of this thread above, in response to the same question:

"So I am using a Masterflex pump with a dual head; 1 line pulls spent water, and the other pushes clean water. Simultaneously. Here is a link to an entire thread on the subject. It is awesome!"


http://www.reefcentral.com/forums/sh....php?t=2349824

Good luck!

bonnie.klassen1
08/28/2017, 07:04 PM
Hi, Bonnie:

As stated in Post No. 15 of this thread above, in response to the same question:

"So I am using a Masterflex pump with a dual head; 1 line pulls spent water, and the other pushes clean water. Simultaneously. Here is a link to an entire thread on the subject. It is awesome!"


http://www.reefcentral.com/forums/sh....php?t=2349824

Good luck!



Thanks so much! (Guess I didn't read enough, sorry!)


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quiltmd
08/30/2017, 06:04 AM
I have a 125gallon mixed reef. Up and stable for a year. I have been doing weekly 8-10 gallon water changes (Red Sea coral pro) and nothing else. No skimmer, no dosing. Nothing.

I would like to start doing less frequent water changes. I am adding a skimmer and I plan to start dosing Nopox, as my nitrates have crept up to 10ppm with the addition of some anthias. I am looking at starting with two part dosing. Will this let me decrease my water changes? How can I tell? Right now parameters are mostly good.

bertoni
08/30/2017, 03:44 PM
<img src="/images/welcome.gif" width="500" height="62"><br><b><i><big><big>To Reef Central</b></i></big></big>
A water change every two weeks or once a month probably will be fine. Once you have the two-part dosing level set, the calcium and alkalinity parameters should be steady. There's no cost-effective way to quantify the need for water changes, but a 15-20% change once a month seems to be fine for most people. Some tanks might need more, at least in theory.

Johnic
09/04/2017, 09:30 AM
So I am using a Masterflex pump with a dual head; 1 line pulls spent water, and the other pushes clean water. Simultaneously. Here is a link to an entire thread on the subject. It is awesome!


http://www.reefcentral.com/forums/showthread.php?t=2349824

Good luck!

I have the same system and love it as well. I set up a timer and every day it exchanges 1 gal of water. It takes the problem away of forgetting or finding time to do it. No mess too!