Auto water change.

[johniii]

Who uses a auto water change? How do you have it plumbed? Does it compensate for salinity?



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[hiimsean]

I plan on setting up a semi-auto change: plumb a drain in my manifold, attach a hose to my mixing station to pump new water into the tank (station and tank will be across the house).

How do you mean compensate for salinity? You mean matching it up, new water vs tank water, or evaporated water?

 

[johniii]

HiImSean;857184 wrote: I plan on setting up a semi-auto change: plumb a drain in my manifold, attach a hose to my mixing station to pump new water into the tank (station and tank will be across the house).

How do you mean compensate for salinity? You mean matching it up, new water vs tank water, or evaporated water?

With my reef angel I could get to salinity probes. One in the tank one in fresh mixed salt water. It can then be programmed to maintain a set number. Say 36ppt. Add ro/di or salt to keep it correct. As you skim and ago adds salinity is dropping slightly. Over time it could make a difference.

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[kirkwood]

following

 

[johniii]

bpatterson617;857196 wrote: What would be the easiest way to automate the salt being added? I have a general idea but wasnt sure if there was a module/add on of some description that was designed for that...

I was thinking a couple float in the tank. And have some low level floats. Push button. Return pump off. Drain start. Low level floats turn off drain pump. High level floats turn on new salt pump. Float switches satisfy pump off. Turn return back on.

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[silver surfer]

I use a stenner dosing pump. Take out tank water at same rate as added new water. It changes water at a slow enough rate so the ato doesn't engage.

Clean and simple.

 

[johniii]

bpatterson617;857222 wrote: Ahh I see. So you would use the salinity probes on your reef angle to make sure the water in your mixing stating and the tank were the same level, however you would still be manually adding the salt to the rodi water in your mixing station correct? I misunderstood, I thought your were going to automate the adding of the salt mix to the rodi water and have it automatically set itself to a predetermined level.





I like the idea, the only potential hickup I see is having the high level float turn on the new salt pump while wating for the low level float to turn off the drain. It seems like there is the potential to have the two pumps working against each other so the water is being pulled out as quickly as its being pushed in. Would it be possible to have the low level float turn off the drain pump and turn on the new salt pump? Then just have the high level float turn off the new salt pump? This may be something you already thought through but it was just an observation that I had. I would love to see a write up on this if you get it working as described! :thumbs:

You would use a relay as a safe guard if pump A relay is on the contacts would hold pump b out. But I will use logic in the controller to prevent it too. You can declare if port a us on port b is off and so on.

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[elfloyd]

Silver Surfer;857221 wrote: I use a stenner dosing pump. Take out tank water at same rate as added new water. It changes water at a slow enough rate so the ato doesn't engage.

Clean and simple.

My plans exactly... In / Out water volume equal. No effect to ATO.

 

[eagle9252]

<span style="color: black"><span style="font-family: Verdana">mine is manual / auto.</span></span>
<span style="color: black"><span style="font-family: Verdana"> </span></span>
<span style="color: black"><span style="font-family: Verdana">Mix salt. </span></span>
<span style="color: black"><span style="font-family: Verdana">Turn off pump</span></span>
<span style="color: black"><span style="font-family: Verdana">Open/close drain valve</span></span>
<span style="color: black"><span style="font-family: Verdana">Open/close mixed SW pump then turn off</span></span>
<span style="color: black"><span style="font-family: Verdana">Open bypass to allow to mix with water in sump while feeding the tank</span></span>
<span style="color: black"><span style="font-family: Verdana">Open to tank and done.</span></span>
<span style="color: black"><span style="font-family: Verdana"> </span></span>
<span style="color: black"><span style="font-family: Verdana">Takes about 10min a week to do 15g. but I let it mix for about an hour to allow the tank to be feed. </span></span>