How to automatic mixing water

[donlite]

What I have set at this point is very simple. I have 2- 30 Gallon drums (coke sells used drums for about $20). One is filled with fresh water and is connected to a float switch in my sump. The other tank has saltwater in it. I use one water lifting pump for the top off and 2 pumps for the water change. The water change pumps turn on and off together throughout the day. The problem is that the 2 pumps must have the same flow rate. I checked them and they are almost the same. I also have a second float switch that turns all the pumps off if something stays on or off. It is not a perfect system but it seems to work.

[sphelps]

Originally Posted by donlite

What I have set at this point is very simple. I have 2- 30 Gallon drums (coke sells used drums for about $20). One is filled with fresh water and is connected to a float switch in my sump. The other tank has saltwater in it. I use one water lifting pump for the top off and 2 pumps for the water change. The water change pumps turn on and off together throughout the day. The problem is that the 2 pumps must have the same flow rate. I checked them and they are almost the same. I also have a second float switch that turns all the pumps off if something stays on or off. It is not a perfect system but it seems to work.

Yeap a very common method and works well for many people. With almost any system you'll still need to check salinity and make adjustments. Even systems with conductivity probes I still found the calibration/set points required slight adjustment every few weeks.

Rather than matching two pumps I find the use of float switches to remove and replace a consistent amount of water takes a lot of the guess work out.

[golf nut]

Originally Posted by sphelps

Rather than matching two pumps I find the use of float switches to remove and replace a consistent amount of water takes a lot of the guess work out.

Would a double stage cylinder be a better choice if it could be produced inexpensively?what volume would you need to move?

[sphelps]

Originally Posted by golf nut

Would a double stage cylinder be a better choice if it could be produced inexpensively?what volume would you need to move?

Not sure what you mean, can you explain? There is of course is a ton of different methods to remove and replace a consistent amount of water, I just mentioned one that I've used before.

[donlite]

In the end all I used was 2 aqua lift pumps and a 30 gallon tank from coke. The salinity is dead on. They turn on for a few minutes every hour and thats it. I have to use 2 pumps because if I drain first the 3rd aqua lift pump (for water top off, fresh water) will start up.It works very well but make sure the tubes do not fall out of the tank. I water top offed my floor for about 2 hours