What return size with RFG (Random Flow generators) from duel return pumps with UV.... RFG - are they any good ones

[Dukereefnz]

What size return pipe / hoses? 1/2inch ?

What return size with RFG (Random Flow generators) from duel return pumps with UV....
RFG - are they any good ones?

https://vividcreativeaquatics.com/product-spotlight/random-flow-generator/

Tank details
85G DT and 35G sump (based on 50% volume) = 120G total water volume. Or 454 litres.

Over flow 1200GPh - Modular Marine - with 3/4" bean animal.
X-1 Filter roller
Duel 2 x DCP-3500 pumps. - 925GPH each
Deltec 600i skimmer
Bubble Magnes - CR120 Calcium reactor feed with a FX-STP2 dosing pump - yet to purchase...

Turn over ... x6

DT turn over x 6 = (454 litres) = 2724 litres per hour / 2 = 1362 litres per pump.
So I guessed 1362 litres SHOULD be possible from 3500 litres rated pumps? yes?
1362 liters = 359 GPH per pump.

Pumps...

Pump 1 - DCP-3500 will feed a Lifegard 3" x 55w UV @ 350GPH - ideal flow rate from what i have read.
Pump 2 - DCP-3500 will go straight to the DT. So flow rate can be what ever.
Pump (what size?) - in section one after but with (roller filter, with skimmer) to feed a manifold for reactor, ATS and refugium .. or more a copepod / life rock sanctuary.

So what size returns pipes??...... and RFG? or not? twin returns to 4 x RFG's?
Any good RFG's or waste of $$
No holes for return drilled yet....
Check valves??? - prefer not to...

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[Reef.]

IMO having normal duck bill return nozzles pointed to the water surface, breaking it up to help with gas exchange would be more beneficial with a large tank, if you have otherwise good turnover and flow.

 

[Dukereefnz]

Thanks - what about return pipe size?
Same as the overflow or smaller as there will be two returns?
2 x 1/2 inch returns?

 

[Reef.]

Thanks - what about return pipe size?
Same as the overflow or smaller as there will be two returns?
2 x 1/2 inch returns?

Are you having two return pumps?

I wouldn't go smaller, the pump is dc so the flow can be reduced if needed, the specs suggest either a 2/3, 1 inch or 1.25, if you go small, this would reduce your max flow rate and also maybe make the pump noisy.

 

[Dukereefnz]

Yes two returns
3/4" bean animal

Really struggling to work out what size returns?
So 3/4" as well for two returns?

1 to UV to DT
1 to DT

 

[Reef.]

Yes two returns
3/4" bean animal

Really struggling to work out what size returns?
So 3/4" as well for two returns?

1 to UV to DT
1 to DT

Your over flow is small so you could so on the small size, I just worry that pumps can be noisy if you restrict their flow, as said they are dc pumps so can be turned down...I would be inclined to go with the pump specs, and turn down, to be honest you are most likely going to have to turn them right down anyway as two pumps is a good thing to have but the overflow,is not going to keep up with the pumps.

I would try whatever you feel comfortable with, easy changed if you need too.