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ScooterV

RO tube routing

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ScooterV   

I started my initial fill this morning :)  I had picked up a BRS 150 gpd water saver with a single DI canister.  I changed it to two canister DI.  Since they even LOOKED nasty I changed the sediment and carbon blocks, but left the old membranes and what little was left of the old DI just for my initial fill since I'm not all that worried about a small TDS when many water changes to come will be zero.  Anyway, right now with the old stuff I have incoming TDS of 53, post RO of 1.  Post DI even with the really old stuff was 0 but once running about 100 gallons filling reservoirs it now matches 1 so is depleted.  So, if old membranes of an unknown age, combined with being a less efficient water saver is giving me 1 TDS I'm thinking of converting it to a single membrane 75 gpd.  I'll make water more slowly, a higher waste ratio, but also even cleaner post RO and my DI should last a long, long time.  The water may cost more in the end, but I'm lazy and like the idea of few DI changes.

So, confirmation on how to do this.  Waste from membrane one goes to the input of membrane two, membrane two waste has the restrictor.  I'm "assuming" all I need to do is remove membrane two and put the restrictor on the waste line of membrane one?

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drauka   

sounds right.  

 

if your Post RO on both membranes is 1 then your RO membranes are doing a great job.  Personally I would just add a Dual DI canister with new resin to the system as it sits.  But I hate waiting for water.  

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ScooterV   

LOL, true.  With RO and SW bins each holding about 50g I'm thinking I shouldn't often need much, but both of them wait until almost empty before they get refilled and I'll need something RIGHT then!!!

I do have dual DI now.  With new membranes the TDS may be so close to zero it will still last a long time.  I think I'll put both new membranes in after the fill and then decide when it's time to change them again.  At least I'll have a valid comparison.  Guy I got this from said he had it 3 years and they are the original membranes.

 

Thanks!

Edited by ScooterV

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drauka   

I have 50 of water ready for salt and 30 of ro-di for whatever.  my 93 cube uses about a gallon a day for evaporation.  I have a 50 gallon mixing barrel and a 30 gallon brute for RO/DI.  I seem to be refilling them both every 2 weeks.  I do like to have an emergency water supply on hand.  My preference is having enough water on hand to do a 20-30% water change fairly suddenly if the need arrases.   But I am also the guy with as many backup/failsafes on my tank as I can think of.  

 

Edited by drauka

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ScooterV   

Yeah, I'm trying to have as many as I can think of.  Once I start wiring up floats and fire up the Apex I'll be looking for lots of ideas and input :)  My RO/DI is on a latching relay so it doesn't refill until almost empty.  Prevents the RO from cycling, but I should have put the lower switch higher from the bottom to always have more of a reserve :(  I can just leave the float as a plug and add one higher later though, and likely will.

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