RO/DI questions

[Phoric]

Hello, I have Kent HI-S Maxxima RO/DI unit that is brand new (http://www.marinedepot.com/md_viewItem.asp?idproduct=KM1433). This is my first RO unit. I've been making my first batch of purified water after testing it. While the first 10 or so gallons took several hours (4-5), the last 5 gallons I just made took maybe an hour, or just a little over. This is about twice the rated gallons per day for this unit. Do these things speed up after breaking in or should I be worried?

I also noticed that the final stage canister (dark grey filter on the far right) does not fill all the way, and I can see the water trickling down the inside of the canister. Is this normal behavior? Could something be clogged and therefore the water is bypassing this canister somehow?

Thanks!

[RandalB]

You are either hooked up to your waste line or you've got good water: 1) pressure 2) Temperature or 3) Low TDS. These are the factors that make RO units produce more than rated.

There are a couple of manufacturing errors that could also run water through faster, so check your product water at the membrane (Before DI) and post the results. If I don't catch it I'm sure AZdesertrat or one of the sponsors will chime in.

The DI canister question: This is normal no worries there.

HTH,
RandalB

[Phoric]

I'm using the blue output line (verses the orange one) which takes longer to start flowing and it flows slower, so I assumed it was the correct one. I wonder if it had something to do with temperature like you said, as when it was running faster the water was warm.

Unfortunately I dont have a TDS meter at the moment so I guess I'll have to order one.

Thanks,

[JW Jersey]

Your not running hot water through the ro are you? I belive the optimal water tempature is about 70F. My city water tds is 260ish and I have a 100 gpd unit and It makes 5 gallons in about 1.5 Hrs. at 60 psi at about 45 F.

[jamison74]

make sure your membrane is seated properly, this is usally the cause of overproduction

[Phoric]

It wasn't hot water, just kinda on the warm side. I'll double check the membrane tomorrow, although I'm certain I seated it well when I installed it.