Help with flow thru UV

[roggy23]

Pump at full strength just causes the water level in pump chamber to drop so no equilibrium..only when I start closing the valve and lowering flow does it find a balance.. if i adjust valve does that mean my uv wont experience the 951 gph flow that I am in need of?

 

[DaddyFish]

You are correct, closing valve will restrict flow from the return pump back to the tank.
BTW, you probably aren't going to get anywhere near 951 gph even with the valve completely open.

1. I'm seeing the max gph on a Sicce Silent 4.0 as 951 gph. You say you have a 3.0? That's rated at 741 gph.
2. Typical head pressure derates/reduces the actual max flow to roughly 50-60% of max rated.

You will need to reconfigure the return plumbing and set the UV as a bypass with it's own gate valve in order to balance total flow against UV flow.

I assume you already know you'll need roughly a 50-watt UV to kill algae at 900-ish gph?

 

[roggy23]

You are correct, closing valve will restrict flow from the return pump back to the tank.
BTW, you probably aren't going to get anywhere near 951 gph even with the valve completely open.

1. I'm seeing the max gph on a Sicce Silent 4.0 as 951 gph. You say you have a 3.0? That's rated at 741 gph.
2. Typical head pressure derates/reduces the actual max flow to roughly 50-60% of max rated.

You will need to reconfigure the return plumbing and set the UV as a bypass with it's own gate valve in order to balance total flow against UV flow.

I assume you already know you'll need roughly a 50-watt UV to kill algae at 900-ish gph?

Thank you for replying..sorry I do have a 4.0 sicce and a 40 watt pentair uv

 

[roggy23]

You are correct, closing valve will restrict flow from the return pump back to the tank.
BTW, you probably aren't going to get anywhere near 951 gph even with the valve completely open.

1. I'm seeing the max gph on a Sicce Silent 4.0 as 951 gph. You say you have a 3.0? That's rated at 741 gph.
2. Typical head pressure derates/reduces the actual max flow to roughly 50-60% of max rated.

You will need to reconfigure the return plumbing and set the UV as a bypass with it's own gate valve in order to balance total flow against UV flow.

I assume you already know you'll need roughly a 50-watt UV to kill algae at 900-ish gph?

I wish I knew how to configure the plumbing like you mentioned

 

[DaddyFish]

I wish I knew how to configure the plumbing like you mentioned

Here's a diagram I found...

 

[takitaj]

Is the UV pump an addition to an existing return pump or are you just sending the return through it?

Also you will need to add additional water (salt) to maintain the same level as it takes a couple gallons to fill the body of the UV.