30min on/off Pump Cycle

[robocop1906]

Hello, I have a fresh Saltwarter mixing container that I don't want to have the pump on all the time to keep the water from going stale. I'm thinking a 24hr 30min on 30min off cycle. Is this possible?

My first thought would be to keep the string below going until I get to 24hrs. hoping there is an easier way.

Fallback ON
Set ON
if time 00:00 to 00:30 then on
if time 00:30 to 01:00 then off

[zombie]

Once the water is clear, continuing to mix will lead to precipitation. IMO it's best to mix only once or for just a short period once or twice a day for a short enough period that the pump impeller wont heat up. To do the latter, this is a good approach (set the VO to AUTO when you mix a new batch)

JustMixed (virtual outlet)
Set ON
When On > 360:00 Then OFF

Mixing pump
OSC 000:00/000:10/710:00 Then ON
If Output JustMixed = ON Then ON
If LowSwitch CLOSED Then OFF




Sent from my SM-G965U using Tapatalk

[XLOR8T]

Once the water is clear, continuing to mix will lead to precipitation. IMO it's best to mix only once or for just a short period once or twice a day for a short enough period that the pump impeller wont heat up. To do the latter, this is a good approach (set the VO to AUTO when you mix a new batch)

JustMixed (virtual outlet)
Set ON
When On > 360:00 Then OFF

Mixing pump
OSC 000:00/000:10/710:00 Then ON
If Output JustMixed = ON Then ON
If LowSwitch CLOSED Then OFF




Sent from my SM-G965U using Tapatalk

Sorry I’m still new but what’s the difference between keeping circulation going in a saltwater mixing tank vs the aquarium. I know some salts are prone to precipitation. But I’m talking about those that aren’t. Wouldn’t keeping it heated and circulating mimic the aquarium itself?


Sent from my iPhone using Tapatalk

[robocop1906]

My container is also closed lid so that would mitigate precipitation.

[robocop1906]

NM, I was thinking evaporation. Can you explain this part of the code? OSC 000:00/000:10/710:00 Then ON

[zombie]

The difference is that the aquarium has rock and sand that acts as a buffer to precipitation that a container doesnt have

The OSC statement turns on the pump for 10 minutes every 12 hours to keep things mixed but not long enough to heat up the pump. Unlike most solids, calcium carbonate is more soluble at lower temperatures and the solubility is also dependent on pH. At lower temperatures CO2 is more soluable, which can help lower pH and prevent precipitation.

Sent from my SM-G965U using Tapatalk

[XLOR8T]

The difference is that the aquarium has rock and sand that acts as a buffer to precipitation that a container doesnt have

The OSC statement turns on the pump for 10 minutes every 12 hours to keep things mixed but not long enough to heat up the pump. Unlike most solids, calcium carbonate is more soluble at lower temperatures and the solubility is also dependent on pH. At lower temperatures CO2 is more soluable, which can help lower pH and prevent precipitation.

Sent from my SM-G965U using Tapatalk

How about a DC pump running at 10-20% and no heater in a cold basement? Thinking for a AWC saltwater holding solution.


Sent from my iPhone using Tapatalk

[zombie]

How about a DC pump running at 10-20% and no heater in a cold basement? Thinking for a AWC saltwater holding solution.


Sent from my iPhone using Tapatalk

That would be much less likely to precipitate. The issue is a local heat increase, which for many pumps can exceed 100 degrees on the impeller and that's what causes the precipitation. A DC pump at a low percentage likely wont get that local temp increase.

Sent from my SM-G965U using Tapatalk

[Todd]

OSC command is Min:Seconds, so should be OSC 000:00/010:00/710:00 Then ON for 10 minutes out of 12 hrs.