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There’s no real calculation because the numbers are so variable. I would have a guess that you might use 20 litres a week but that is a guess. You will use more on top up in the winter compared to the summer too. A 50 gpd would make 9.4 litres a hour roughly, but this depends on water temperature going in, water pressure and condition of the membrane. My advice would be to by as high a gpd unit as you can afford factoring in service costs. Always nice to have your partner in your corner Tim
I'm with Tim on the speed, get the fastest you can. I get about 10L/hr in summer with my 50GPD unit, much less in winter. My water pressure is good, expect lower rates if water pressure is under 60PSI (or factor in the cost of a booster pump). Also, I don't have a garage either so I store my RODI in a water butt outside in the garden, plus a couple of emergency 25L containers stashed in the loft...
It’s because the air in the winter is drier and it’s made worse by heating being on, this allows more moisture to be drawn from your tank because there’s more space for it in the air.
I'm around 2l of RO top off per day max which includes skimming rather wet and evaporation on a similar sized system .
As said, it massively varies. How dry is the air in your house? How big is the surface area of the tank? How much water movement is there, making that significantly larger? Etc. You're unlikely to find an RODI that won't keep up with your demand though. It's more a question of how quickly you want to produce it. Get 100L done in an hour and have it over with, or produce smaller amounts more often, or the larger amount over a few hours. I highly recommend calling Vyair www.vyair.com and asking them for advice for a marine tank. Their customer service is excellent.
Good stuff... I won't know about the water pressure until next June so I will have to wait until then to see if i need a booster pump. Thanks for he info :) Nice to meet someone else without a garage... and I never thought about the water butt idea. That could be a very useful! Ahhhhh that's clever. Nicely explained :)Thanks. I'll say about 20L as a rough estimate and take it from there :) That's a good point. I suppose if I bought one at 50gpd then I have to put 8 hours aside per week to get it done. Let's face it, that's most of Saturday gone. If I get a faster one then I've got some leniency about what time of day I get the water done.Thank you everyone! This has been helpful!Sent from my SM-G950F using Tapatalk
Don't have time to answer properly but you can get an auto shut-off with a float valve so you don't have to wait aroundSent from my Mi A1 using Tapatalk