[krave]

Got a 4040 hf5 ro and the pre filters rigged up. Am i ok to plug it up to my garden tap on flush to check my water pressure. Only for a minute, then bring it back in.

Does it have to be on flush to check pressure or does the flush tap need to be closed (if closed will it do damage). and a di vessel after ro wont cause pressure to drop before ro to much will it??

Just need to know if I need a Booster pump.

[Window Washers]

Got a 4040 hf5 ro and the pre filters rigged up. Am i ok to plug it up to my garden tap on flush to check my water pressure. Only for a minute, then bring it back in.

Does it have to be on flush to check pressure or does the flush tap need to be closed (if closed will it do damage). and a di vessel after ro wont cause pressure to drop before ro to much will it??

Just need to know if I need a Booster pump.

your fine to plug it in,
You will not damage a membrane fully closed or open, not that you should run a membrane on flush fully closed,

Why do you need to connect the ro to check your tap pressure ??

[krave]

I thought if I just run it through the pre filters back into the sink there would be no pressure to read... As i can blow straight through them....

Also should the carbon one be first or decond in sequence?

Cheers mate!

[Window Washers]

I thought if I just run it through the pre filters back into the sink there would be no pressure to read... As i can blow straight through them....

Also should the carbon one be first or decond in sequence?

Cheers mate!

carbon second

[[GQC] Tim]

I really reallly hope you mean hooking it up with prefilters attached. Do not ever hook it up without prefilters attached because you will ruin your membrane, there is no if's or but's, it's will get damaged, a lot. 

You never check pressure on the flush setting, because it will be incredibly low. Do not close the flush valve completely.

To do this properly, to make a 'flush kit', you need two 'Y' pieces, four pieces of garden hose, and two inline ball taps, and a load of jubilee clips. This is all 1/2" btw. Connect the first 'Y' piece to the waste pipe. Fit the two hose pieces on both outlets. Put one valve on each hose piece, then put the other two hose pieces on both valves. Connect the two pipes coming out of the valves to the other 'Y' piece, and connect the 'Y' piece to the rest of the waste pipe.

This way, you can have one valve set to a preset standard so you have a 60/40 or 70/30 waste to pure ration. The other valve you simply open all the way if you want to flush the 4040.

To measure the correct ratio of pure to waste, get a stopwatch, measure the amount of pure produced, and the amount of waste produced. So let's say after 1 minute you had 1500ml of pure, and 3000ml of waste. Add the two together, which is 4500ml. That is 100%, divide this by 100. Which is 45. To get the percentage of pure and waste, divide the 1500 and 3000 in this example by 45.

1500ml pure = 33.3%
3000ml waste = 66.6%

So your ratio pure to waste is 33.3/66.6, a safe figure.

Hope that makes any sense to you.

Edit : Picture attached, sorry for the low quality. I made this real quick when I first setup my 4040, it looks a bit more decent now with clear, reinforced tubing and is cabletied to the tank cage.

[Window Washers]

I really reallly hope you mean hooking it up with prefilters attached. Do not ever hook it up without prefilters attached because you will ruin your membrane, there is no if's or but's, it's will get damaged, a lot. 

You never check pressure on the flush setting, because it will be incredibly low. Do not close the flush valve completely.

To do this properly, to make a 'flush kit', you need two 'Y' pieces, four pieces of garden hose, and two inline ball taps, and a load of jubilee clips. This is all 1/2" btw. Connect the first 'Y' piece to the waste pipe. Fit the two hose pieces on both outlets. Put one valve on each hose piece, then put the other two hose pieces on both valves. Connect the two pipes coming out of the valves to the other 'Y' piece, and connect the 'Y' piece to the rest of the waste pipe.

This way, you can have one valve set to a preset standard so you have a 60/40 or 70/30 waste to pure ration. The other valve you simply open all the way if you want to flush the 4040.

To measure the correct ratio of pure to waste, get a stopwatch, measure the amount of pure produced, and the amount of waste produced. So let's say after 1 minute you had 1500ml of pure, and 3000ml of waste. Add the two together, which is 4500ml. That is 100%, divide this by 100. Which is 45. To get the percentage of pure and waste, divide the 1500 and 3000 in this example by 45.

1500ml pure = 33.3%
3000ml waste = 66.6%

So your ratio pure to waste is 33.3/66.6, a safe figure.

Hope that makes any sense to you.

Edit : Picture attached, sorry for the low quality. I made this real quick when I first setup my 4040, it looks a bit more decent now with clear, reinforced tubing and is cabletied to the tank cage.

I'm now confused     

[[GQC] Tim]

Sorry, yes it can read a bit confusing. 

I think that's right anyway, I'm a bit tired, so hope it makes sense.

[krave]

I had the pre filters on, And the flush valve open, when it was like this, the first pressure before filters was 10 and after 0psi. I then hadthe flush valve almost shut and had a very slow stream coming out (only for about ten secons tops) first pressure went up to about 50 and second 45psi.

My tap also has a leek so should be better than that.

So I assume my water pressure is fine for the Hf5.

Does anyone know what production rates are for this membrane with that psi?

Cheers....

Tim, tbh didnt read your message, started to and sounded a bit complecated in my tiredness. Will suss it out after dinner!

[Ian Lancaster]

Tim,

It's easier to think of it a a simple ratio.  Your figures show a ratio of 2/1 - two volumes of waste to one volume of pure, or to put it another way  you produce two gallons of waste water for every gallon of pure.

I'm not sure that's a safe ratio, I was running at 2/1 but noticed I was getting less product from a fill of resin.  I checked the TDS coming out of the RO and it was .020  Pressure was 75psi after prefilter.

I increased waste production gradually, testing as I went and the best I could get was .016  At this level I got a pressure reading of 60psi (makes sense, as you open the bypass to increase waste, the pressure must drop)

I don't know what ratio I'm getting now, I'll check it some other time.  The important thing is I'm getting the best result the membrane seems to be able to deliver so the ratio must be about right.

I use a 24/7 rated booster pump.

[[GQC] Tim]

Interesting Ian, like you I still need to finetune my system, but the output isn't too bad.

235ppm in, 45psi after prefilters, product water is 13ppm. No booster pump, straight out the tap. This is an HF-4 btw. When the weather is a bit better I will try and experiment a bit more. Correct me if I'm wrong, but isn't the problem that the more waste you let through, the less pressure is actually on the membrane? So, having a higher waste ratio might not be that benificial for low ppm?

Still though, RO man for instance recommends a 4 to 1 ratio. I think that's an incredibly high waste. Personally, if I had the space in the garden I would have just gone with a smalller RO, on for 24/7. I'm not on a water meter luckily, but it's hard to swallow the amount of gallons that go down the drain with a 4040.

[Ian Lancaster]

Correct me if I'm wrong, but isn't the problem that the more waste you let through, the less pressure is actually on the membrane? So, having a higher waste ratio might not be that benificial for low ppm?

Concerning the pressure, that's what I said: as I increased the waste, the pressure fell from 75psi to 60psi, but interestingly the output at 75 was 20ppm and at 60 was 16ppm.  I assume the difference is because the membrane needs the extra waste to keep the surface free of filtered particles.

Your product TDS is interesting: I calculated mine as having had 94.48% of impurities removed and thought this wasn't as good as it should be.  I looked at yours and thought you were achieving much better, but in fact it works out at 94.47%, so just about the same.  According to RO-man I should be getting 97-99% but that always sounded optimistic to me.