Re-plumbing my tank

[Signalhead]

I'm think on rotating my sump 180° in order to have the socks in the front and make it easier to replace with clean ones.
I have 3- 1" pipes drilled into the tank. On the sump from right to left, water comes into the pump and the socks. Next to the left is the skimmer and a pump to my UV, next the refugium, baffles and return pump compartment. Back into the tank with 1". The UV fittings are 3/4 inch and it comes from the 2nd pump and back to the return pump space.
The question is when I rotate the sump, can I feed the UV from the return pump and then into the tank?
Or should I get new elbows with 1"? To keep all the same size
I have the concern of going from 1" to 3/4" and back to 1" and it is going to screw up the water pressure

Any idea or suggestions from people with more experience will be appreciated.

Thanks

 

[slojim]

can you feed the UV from your tank drain?

 

[Signalhead]

Do you mean before the socks?

 

[slojim]

yes. I feed my ATS this way. I had trouble with plumbing so there is a second high spot right before the ATS which can trap some air for a bit if the circulation shuts down. I can play with my drain valves a little if I'm impatient. And I think my small return pump is a factor.

 

[Signalhead]

But it will feed the UV from gravity? Do you have pictures?
Will I need a check valve ?

 

[slojim]

Sorry - but now that it is against the wall, I cant get a reasonable pic that shows you what it is doing. I'll try to explain. I run a bean-style system. The siphon tube from the overflow drops down behind the tank, goes through a valve for tuning the siphon, then tees to 2 different directions. One direction goes through a valve for adjusting the split flow and drops into a bucket (my skimmer compartment). This stays full size and can handle all the flow reliably. The other direction necks down to 3/4", goes through a valve that shuts off the ATS for maintenance, rises up slightly due to space restrictions, and goes into the ATS, which drains into my return pump area. This works ok. I try so split the flow between ATS and skimmer, with a little more to ATS. Ordinarily, the skimmer runs in the day and the ATS lights are on at night. If there is a power loss to the return pump more than 10-15 minutes, it can trap some air right before the ATS that takes some time to purge out, so the system cycles on the open channel drain until it purges.
I don't need a check valve. I don't know anything about running UV. If it needs to stay full while on, then maybe.