Let's talk about a 24/7 continuous drip water change

Triggreef

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Like the title suggest just looking for some info sharing about the method. I have been doing this for about the last year utilizing a 250g stock tank as a reservoir feeding 2 separate systems, one is about 180g and the other is about 360g. This is by far the best system I've used in my opinion, but it's not perfect. I don't think I've lost any corals at all since starting this method and growth has never been better for me. For comparison sake other methods I've used for keeping stable parameters and lowering nutrients include:
Regular large partial water changes.
2 part dosing.
Triton products and testing.
Ca reactor.
LC dosing for po4.
Gfo.
Activated carbon.
If there's anything else I didn't list I've probably tried it.

For those that don't know what I'm talking about, the simple description is you mix enough saltwater to last a while and continuously drip that water into your system. Need to have a way for water to exit the system also to avoid the obvious problem of overflowing your system. Will need to do some easy calculations to figure out how to accomplish the drip at the correct flow for what your trying to accomplish.

For me, I go through about 20g per day for both systems. I do no other dosing for any elements and depend on the continuous supply of new saltwater to maintain all my levels. In the beginning I've found for my systems that amount won't maintain ca or alk sufficiently. So what I've done to combat that issue is when I mix new water I boost the ca and alk and that seems to work for me.

Obviously there are still variables like the brand of salt you use. I use fritz rpm because it's the cheapest buying it in bulk. It also happens to mix low for ca and alk. Maybe spending more on better salt could eliminate the need to boost those.

Some pros to the method...
Very stable once you figure out your needs.
Simple to maintain.
Very low maintenence.
No need for expensive equipment.
Eliminates need for daily or weekly testing.
Nutrient removal combined into dosing.
Eliminates need for water top off.

Some cons
Expensive to buy salt. Although I'm not using much more than doing regular changes anyway.
Space requirements to keep mixed water.
Lines getting clogged...

Which leads me to my first question to others that enjoy this method. I use 1/4 inch ro tubbing to dose from my large water tank. Several times it's become clogged from calcification, this time so clogged that I cannot clear it. I'm going to try upgrading to 3/8 Silicon tubing in hopes that will solve the problem. Anyone else have any methods to stop that from happening?

The run that I have that problem with is about 30 feet long. I have a shorter run to my other system and haven't had that issue.
 
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Garf

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How are you handling salinity changes from no ATO with this method due to water loss from evaporation?
You can just mix the saltwater up at a lower salinity to account for the loss of any top off, or just dose a set amount of freshwater (like you can with kalk top off).
 

CHSUB

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You can just mix the saltwater up at a lower salinity to account for the loss of any top off, or just dose a set amount of freshwater (like you can with kalk top off).
Assuming consistency in evaporation, nearly impossible imo.
 

Garf

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Assuming consistency in evaporation, nearly impossible imo.
Nah, it's OK in larger volumes;

 

CHSUB

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Nah, it's OK in larger volumes;

Ok, possible. Easier way just do auto WC with ato. I did it. Right?

20241202_142936.jpg
 

Sisterlimonpot

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Which leads me to my first question to others that enjoy this method. I use 1/4 inch ro tubbing to dose from my large water tank. Several times it's become clogged from calcification, this time so clogged that I cannot clear it. I'm going to try upgrading to 3/8 Silicon tubing in hopes that will solve the problem. Anyone else have any methods to stop that from happening?
I've had a similar situation where I use a peristaltic pump to move new saltwater from a premixed bin through 1/4" rodi tube. And over the course of a few years it does clog. And for me it's way worse because the tube is inside the wall. My immediate solution was to slowly pump muriatic acid through the tube to clean it out, but that is extremely tedious and not great when in a confined space breathing the fumes. After about 2 times of doing that (every 2 years), I've added an extra bin for mixing new salt and then after 1-2 weeks of mixing I transfer that to the salt bin that has the 1/4" tube. That seems to solve the issue. I do wish that I used 1/2" tube behind the walls or at least used conduit so that I can replace the 1/4" tube when it gets clogged. So yes, I have experienced that same issue.
 

Troylee

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Oh wait, this isn't the same as an AWC?

I read the description and noticed he left out how he removes old saltwater. But I figured that was a simple oversight.

I guess I would need to understand the benefit vs the traditional awc?
Personally I’ve found larger changes more beneficial then little ones here or there.. too big thou and it seems to shock the growth for a minute as the biome readjusts I believe..
 

twentyleagues

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In the freshwater world this is called a flow through system and is quite easy to implement. I would be interested in understanding how the top off is handled. It may not be as difficult as I imagine it to be.
 

Randy Holmes-Farley

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I discuss and compare all types of water changes here, including the one in this thread which is basically slow continuous water change. It is nearly identical to the changes I actually did, which was about 20 x 15 minute slow changes amounting to about 1% water volume daily.

Water Changes in Reef Aquaria by Randy Holmes-Farley - Reefkeeping.com

example:

Figure 13. An overlay of Figures 3 and 12 to allow comparison of the differences between nitrate depletion using daily and monthly water changes of the same amount changed.

1733170885729.png
 

buruskeee

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So the old water isn't being removed?

Some pros to the method...
Very stable once you figure out your needs.
Simple to maintain.
Very low maintenence.
No need for expensive equipment.
Eliminates need for daily or weekly testing.
Nutrient removal combined into dosing.
Eliminates need for water top off.

I'm not sure how nutrients are being removed if there is no tank water being removed. Also, even with a low salinity salt mix, the salinity in the tank will still climb since evaporated water is being replaced with salt water - leading to the need of removing water.
 

Randy Holmes-Farley

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So the old water isn't being removed?

It is:

"Need to have a way for water to exit the system also to avoid the obvious problem of overflowing your system."

I personally used the same pump (dual head). Not sure what the OP uses.
 

buruskeee

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It is:

"Need to have a way for water to exit the system also to avoid the obvious problem of overflowing your system."

I personally used the same pump (dual head). Not sure what the OP uses.
Ahh ok, so a typical AWC system.

I was confused by this statement.
Eliminates need for water top off
ATO would still need to be implemented for evap because otherwise salinity will rise.
 

twentyleagues

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Ahh ok, so a typical AWC system.

I was confused by this statement.

ATO would still need to be implemented for evap because otherwise salinity will rise.
I have seen it handled by an overflow mostly to a drain but the pump would make it a awc less of a flow through.
I am with you on the ato which is what I am having a hard time envisioning how to incorporate that with a typical flow through. I guess if enough was flowing through it may negate the ato...?
 
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Triggreef

Triggreef

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Ahh ok, so a typical AWC system.

I was confused by this statement.

ATO would still need to be implemented for evap because otherwise salinity will rise.
Could be added to cons list I guess to still have to check specific gravity now and then. I mix my water slightly low and have not had any issues with this fluctuating too much. Like I general mix at 1.020 to 1.022. I aim for 1.025 in each system normally.
 
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Triggreef

Triggreef

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I have seen it handled by an overflow mostly to a drain but the pump would make it a awc less of a flow through.
I am with you on the ato which is what I am having a hard time envisioning how to incorporate that with a typical flow through. I guess if enough was flowing through it may negate the ato...?
I have an overflow in my sump directly to outside. I mix my new water slightly lower to account for evap. No real science behind it just guesstimate on this aspect by trial and error.
 

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