Uv flow question.

[thekap2]

I am think of having a schedule for different flows going through my uv. I figure I can just adjust my dc return pump from my Neptune on a schedule. My question is will this be effective and also what type of schedule should I do. Would 4 hours low flow 20 hours high flow be good? Or should I go more like 12/12?

 

[Waters]

It honestly doesn't really matter. What are your primary concerns that you are trying to solve using UV? I normally just pick a flow between the recommended values for parasites vs bacterial/algae blooms and go with that. If you are more concerned about free swimming parasites go longer on the slower flow. If that isn't a huge concern, have more tank turnover and go with the faster flow. A lot would depend on the size of the unit vs tank size.

 

[FindinNemo]

Adjusting the flow through your UV sterilizer based on a schedule can be an effective method for maximizing its effectiveness while also reducing energy consumption during certain periods. Here are some considerations to help you design an effective schedule:

Effectiveness of Adjusted Flow​

1. UV Contact Time: The effectiveness of a UV sterilizer largely depends on the contact time between the water and the UV light. Lower flow rates increase the time water spends in the UV chamber, which enhances the sterilization effect. However, prolonged periods of low flow can also lead to inadequate water turnover in your system, which may allow for potential pathogen resurgence.
2. Type of Organisms: Consider the objective of your UV sterilization. If you’re primarily targeting free-floating microorganisms (like algae or harmful bacteria), maintaining a low flow for an extended period might be beneficial. Conversely, if you aim to ensure clarity and overall water quality, higher flow rates with consistent turnover might be more useful.

Suggested Schedules​

Your proposed schedules have merit, but let’s explore them along with a few alternative options:

1. 4 Hours Low Flow / 20 Hours High Flow:
   • Pros: This schedule allows for concentrated sterilization during low flow periods while still ensuring adequate water turnover for overall system health during high flow.
   • Cons: The extended high flow period may result in less effective sterilization, as water rushing through the UV unit may not spend sufficient time there.
2. 12 Hours Low Flow / 12 Hours High Flow:
   • Pros: This balance allows for significant sterilization in both low and high flow modes. The consistent half-day on each schedule can provide reasonable contact time while ensuring decent water turnover.
   • Cons: Depending on your system's flow requirements, a 12-hour low flow may still result in reduced circulation in your system.
3. Alternating 1-2 Hour Intervals:
   • A shorter cycle could also work well, cycling between low and high flows every hour or two. This provides regular sterilization bursts while allowing fresh water to pass quickly through the UV sterilizer.
4. Seasonal Adjustments:
   • Consider the biological load in your aquarium. During high feeding or algae growth periods, you might want a more extended low flow period. Conversely, during stable periods, you could dial it back to more frequent high flow.

Monitoring and Adjusting​

• Experiment and Monitor: Start with one of the suggested schedules, then monitor your water clarity, algal growth, and overall health of your tank. Adjust the schedule based on your observations.
• Automate Adjustments: If you’re using a Neptune system, you can easily set up these schedules to see what works best and make changes as necessary to optimize both flow and sterilization.

Conclusion​

Ultimately, finding the balance between effective sterilization and adequate system flow will depend on your specific tank conditions, the biological load, and the species you are keeping. Testing different schedules and monitoring the effects will help you hone in on the best approach for your setup. Don’t hesitate to share your experiences as you fine-tune your UV flow management! Best of luck!

 

[BoredNuke]

Did you actually set this up and find a sweet spot? Planning on a dual return pump system with one leg of uv that can be dialed down at night and make up for the flow on other side.