water vs. water

I already have RO/DI unit. Tomorrow the pump should arrive (finally!!!)
I do not know the exact pressure from my faucet, but the RO/DI water
dripping, rather than flowing from the output of the unit. I live in
apartment on third floor, so I figured, that it is way too low.


"Boomer" wrote in message
...
You are waiting for RO/D unit or a RO/DI booster pump ? Will this booster
pump produce a
pressure that is acceptable to the RO/DI. How high a pressure dose it
produce ? What is
you tap water pressure. ?

--
Boomer

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Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS

If You See Me Running You Better Catch-Up


"Paul" wrote in message
...
: ... I am still waiting for my RO/DI booster pump to arrive, meanwhile
could
: I use distillated water instead of RO/DI?
:
:
:

Small home type RO units only make a few gals / day , so how much does yours make ? If
your line pressure is low there will be a much lower output. Most home units work best at
about 65 psi. With a line pressure of say 30 psi the output will be about cut in half.
This is where the booster pump comes in. RO membranes have a certain pressure value which
should not be exceeded and if done so will blow-out the membrane. Most booster pumps put
out 80 psi. and some are adjustable. Most tap water lines run around 30-50 psi but may be
a little higher or lower. Higher pressure will not only make more RO but it will also be
more pure with less waste water. Still, you need to find out what pressure your RO is
rated at. If, for example, your RO was rate at 60 psi and you subjected it to greater than
that, there is going to be problems.

--
Boomer

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Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS

If You See Me Running You Better Catch-Up


"TekCat" wrote in message
...
:I already have RO/DI unit. Tomorrow the pump should arrive (finally!!!)
: I do not know the exact pressure from my faucet, but the RO/DI water
: dripping, rather than flowing from the output of the unit. I live in
: apartment on third floor, so I figured, that it is way too low.
:
:
: "Boomer" wrote in message
: ...
: You are waiting for RO/D unit or a RO/DI booster pump ? Will this booster
: pump produce a
: pressure that is acceptable to the RO/DI. How high a pressure dose it
: produce ? What is
: you tap water pressure. ?
:
: --
: Boomer
:
: Want to talk chemistry ? The Reef Chemistry Forum
: http://www.reefcentral.com/vbulletin/index.php
:
:
: Former US Army Bomb Technician (EOD)
: Member; IABTI, NATEODA, WEODF, ISEE & IPS
:
: If You See Me Running You Better Catch-Up
:
:
: "Paul" wrote in message
: ...
: : ... I am still waiting for my RO/DI booster pump to arrive, meanwhile
: could
: : I use distillated water instead of RO/DI?
: :
: :
: :
:
:
:
:

"Boomer" wrote in message ...
Small home type RO units only make a few gals / day , so how much does yours make ? If
your line pressure is low there will be a much lower output. Most home units work best at
about 65 psi. With a line pressure of say 30 psi the output will be about cut in half.
This is where the booster pump comes in. RO membranes have a certain pressure value which
should not be exceeded and if done so will blow-out the membrane.

Is there an easy way to make booster pump cycle less often ?
I tried to hook-up the booster pump to my unit but the pump
seemed too strong and it pulsed 2-3 times per second causing
noise unbearable for my family.

p.s.
Do you maybe know what is the maximum pressure for membranes sold by KENT ?

I do not know what you mean by cycle. A booster pump should keep a constant pressure on
the RO membrane. Cycling would be self-defeating, for if the pressure changes, do to a
on-off phase, there would be a continuous pressure difference on the membrane.

Or are you talking about a RO container pressure pump, that keeps made RO water in a
container at x pressure to pump to y place.

For the Kent unit, just go to their website and e-mail them.


--
Boomer

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Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS

If You See Me Running You Better Catch-Up


"Pszemol" wrote in message ...
: "Boomer" wrote in message ...
: Small home type RO units only make a few gals / day , so how much does yours make ? If
: your line pressure is low there will be a much lower output. Most home units work best
at
: about 65 psi. With a line pressure of say 30 psi the output will be about cut in half.
: This is where the booster pump comes in. RO membranes have a certain pressure value
which
: should not be exceeded and if done so will blow-out the membrane.
:
: Is there an easy way to make booster pump cycle less often ?
: I tried to hook-up the booster pump to my unit but the pump
: seemed too strong and it pulsed 2-3 times per second causing
: noise unbearable for my family.
:
: p.s.
: Do you maybe know what is the maximum pressure for membranes sold by KENT ?

"Boomer" wrote in message ...
I do not know what you mean by cycle. A booster pump should keep a constant pressure on
the RO membrane. Cycling would be self-defeating, for if the pressure changes, do to a
on-off phase, there would be a continuous pressure difference on the membrane.

Or are you talking about a RO container pressure pump, that keeps made RO water in a
container at x pressure to pump to y place.

OK, more details...
I have got Aquatec DDP5800, what they call "a demand/delivery pump".
Hooked it up to my KENT 10gpd barebone RO system and turned the pump on.
There was a pressure gauge in between the pump and the prefilters...

When the pump was cycling on and off on the limit switch I saw the gauge
going from the 40PSI (my tap water static pressure) to 65-70 PSI the moment
the pump was on. 1/4, maybe 1/8 of the second later the pump turned off itself on
the pressure switch and the pressure started decreasing to the 40PSI when the
pump turned itself on again... This cycling seem to be due to the fact the pump
had large capacity and pumped pressure high up really quick reaching the limit.
The water did not have the way to escape through the RO filter that quickly so
the pump turned off. When the pressure relatively slowly dropped back to the
40PSI the pump turned itself back again...

I almost feel like I need a "water capacitor", using kind of electrical analogy...
Some flexible device/container which could take the pressure from the pump
and release it over time feeding the need for water of the RO filter... Or a much
smaller capacity pump which will just barely keep up with RO filter demand.

Your water capacitor is a bladder tank, or pressure tank. It is
normally a metal tank with a rubber bladder in it with a fitting on one
end for the water and the other for air to pressurize the bladder.
Small ones are very common in new houses to help reduce the damage from
water hammer, large ones are used on wells so the pump does not have to
run all of the time. You should be able to find some at your local home
improvement stores in the section that has the pumps.

Kim





Pszemol wrote:
"Boomer" wrote in message
...

I do not know what you mean by cycle. A booster pump should keep a
constant pressure on the RO membrane. Cycling would be self-defeating,
for if the pressure changes, do to a on-off phase, there would be a
continuous pressure difference on the membrane.

Or are you talking about a RO container pressure pump, that keeps made
RO water in a container at x pressure to pump to y place.


OK, more details...
I have got Aquatec DDP5800, what they call "a demand/delivery pump".
Hooked it up to my KENT 10gpd barebone RO system and turned the pump on.
There was a pressure gauge in between the pump and the prefilters...

When the pump was cycling on and off on the limit switch I saw the gauge
going from the 40PSI (my tap water static pressure) to 65-70 PSI the moment
the pump was on. 1/4, maybe 1/8 of the second later the pump turned off
itself on
the pressure switch and the pressure started decreasing to the 40PSI
when the
pump turned itself on again... This cycling seem to be due to the fact
the pump
had large capacity and pumped pressure high up really quick reaching the
limit.
The water did not have the way to escape through the RO filter that
quickly so
the pump turned off. When the pressure relatively slowly dropped back to
the
40PSI the pump turned itself back again...

I almost feel like I need a "water capacitor", using kind of electrical
analogy...
Some flexible device/container which could take the pressure from the pump
and release it over time feeding the need for water of the RO filter...
Or a much
smaller capacity pump which will just barely keep up with RO filter demand.

"kim gross" wrote in message ...
Your water capacitor is a bladder tank, or pressure tank. It is
normally a metal tank with a rubber bladder in it with a fitting on one
end for the water and the other for air to pressurize the bladder.
Small ones are very common in new houses to help reduce the damage from
water hammer, large ones are used on wells so the pump does not have to
run all of the time. You should be able to find some at your local home
improvement stores in the section that has the pumps.

I was thinking about it, but this bladder tank is usualy pumped to 10PSI
so when I put it in the place in the system which has running pressure
60-70PSI would not give me desired effects...
I could pump the bladder tank to higher pressure, something like 80PSI
but I am not sure if the design of such bladder tank allows for this...

Also, a bladder tank is quite large, so combined with my drinking water
bladder tank at the output already would not fit under my kitchen sink ;-)
BTW - Boomer did not mention bladder tank, just adding the booster pump,
so I asked how to make the pump not cycling... I am just curious, since
I have never seen a working filter installation with a booster pump before :-)

That is not a RO booster pump, you have the wrong one. That is a container pump. The
booster pump is the Aquatec CDP-8800 Booster Pump or 6800

Aquatec DDP-5800 Delivery Booster Pump (YOURS)

The DDP-5800 pumps can draw water from a ***holding tank and pressurize it***, or boost
the pressure from a low pressure source.


Aquatec CDP-8800 Booster Pump( WHAT YOU NEED)

For RO Systems*** Over 50 GPM ***- CDP-8800 Series High Flow). The CDP-8800 Series pumps
are also compatible with most hydraulic shut-off valves with the optional PSW shut off
tank controller switch. Distinguishing Features & Operating Benefits: Outstanding
toughness, durability. Designed for 30,000+ operating hours. ***Adjustable pressure boost
between 40-120 PSI.***

Aquatec CDP-6800 Booster Pump.

6800 Series (Low Flow). For membranes ***up to 50 GPD.***


--
Boomer

Want to talk chemistry ? The Reef Chemistry Forum
http://www.reefcentral.com/vbulletin/index.php


Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS

If You See Me Running You Better Catch-Up


"Pszemol" wrote in message ...
: "Boomer" wrote in message
...
: I do not know what you mean by cycle. A booster pump should keep a constant pressure on
: the RO membrane. Cycling would be self-defeating, for if the pressure changes, do to a
: on-off phase, there would be a continuous pressure difference on the membrane.
:
: Or are you talking about a RO container pressure pump, that keeps made RO water in a
: container at x pressure to pump to y place.
:
: OK, more details...
: I have got Aquatec DDP5800, what they call "a demand/delivery pump".
: Hooked it up to my KENT 10gpd barebone RO system and turned the pump on.
: There was a pressure gauge in between the pump and the prefilters...
:
: When the pump was cycling on and off on the limit switch I saw the gauge
: going from the 40PSI (my tap water static pressure) to 65-70 PSI the moment
: the pump was on. 1/4, maybe 1/8 of the second later the pump turned off itself on
: the pressure switch and the pressure started decreasing to the 40PSI when the
: pump turned itself on again... This cycling seem to be due to the fact the pump
: had large capacity and pumped pressure high up really quick reaching the limit.
: The water did not have the way to escape through the RO filter that quickly so
: the pump turned off. When the pressure relatively slowly dropped back to the
: 40PSI the pump turned itself back again...
:
: I almost feel like I need a "water capacitor", using kind of electrical analogy...
: Some flexible device/container which could take the pressure from the pump
: and release it over time feeding the need for water of the RO filter... Or a much
: smaller capacity pump which will just barely keep up with RO filter demand.

"Boomer" wrote in message ...
That is not a RO booster pump, you have the wrong one. That is a container pump. The
booster pump is the Aquatec CDP-8800 Booster Pump or 6800

Aquatec DDP-5800 Delivery Booster Pump (YOURS)

The DDP-5800 pumps can draw water from a ***holding tank and pressurize it***,
or boost the pressure from a low pressure source.

I remember reading this exactly text on their website...
The last part of the description about boosting pressure from a low pressure source
made me buy 5800 model and not look further... :-( I have low pressure source,
40PSI is low :-) and I need to boost it higher to 80PSI :-)))

Well, in this situation, I have one perfectly good DDP-5800 pump for sale

Well, yesterday I got my pump, it is Aquatec CDP-8800, hooked it up inline
between kitchen faucet and the RO 125GPD unit from dvoneb. Well, I
definitely saw the improvement, instead of 2GPD now I got 6GPD, however, it
is not even near the 125GPD. I am going crazy here. Any thoughts?




"Boomer" wrote in message
...
That is not a RO booster pump, you have the wrong one. That is a container
pump. The
booster pump is the Aquatec CDP-8800 Booster Pump or 6800

Aquatec DDP-5800 Delivery Booster Pump (YOURS)

The DDP-5800 pumps can draw water from a ***holding tank and pressurize
it***, or boost
the pressure from a low pressure source.


Aquatec CDP-8800 Booster Pump( WHAT YOU NEED)

For RO Systems*** Over 50 GPM ***- CDP-8800 Series High Flow). The
CDP-8800 Series pumps
are also compatible with most hydraulic shut-off valves with the optional
PSW shut off
tank controller switch. Distinguishing Features & Operating Benefits:
Outstanding
toughness, durability. Designed for 30,000+ operating hours. ***Adjustable
pressure boost
between 40-120 PSI.***

Aquatec CDP-6800 Booster Pump.

6800 Series (Low Flow). For membranes ***up to 50 GPD.***


--
Boomer

Want to talk chemistry ? The Reef Chemistry Forum
http://www.reefcentral.com/vbulletin/index.php


Former US Army Bomb Technician (EOD)
Member; IABTI, NATEODA, WEODF, ISEE & IPS

If You See Me Running You Better Catch-Up


"Pszemol" wrote in message
...
: "Boomer" wrote in message
...
: I do not know what you mean by cycle. A booster pump should keep a
constant pressure on
: the RO membrane. Cycling would be self-defeating, for if the pressure
changes, do to a
: on-off phase, there would be a continuous pressure difference on the
membrane.
:
: Or are you talking about a RO container pressure pump, that keeps made
RO water in a
: container at x pressure to pump to y place.
:
: OK, more details...
: I have got Aquatec DDP5800, what they call "a demand/delivery pump".
: Hooked it up to my KENT 10gpd barebone RO system and turned the pump on.
: There was a pressure gauge in between the pump and the prefilters...
:
: When the pump was cycling on and off on the limit switch I saw the gauge
: going from the 40PSI (my tap water static pressure) to 65-70 PSI the
moment
: the pump was on. 1/4, maybe 1/8 of the second later the pump turned off
itself on
: the pressure switch and the pressure started decreasing to the 40PSI
when the
: pump turned itself on again... This cycling seem to be due to the fact
the pump
: had large capacity and pumped pressure high up really quick reaching the
limit.
: The water did not have the way to escape through the RO filter that
quickly so
: the pump turned off. When the pressure relatively slowly dropped back to
the
: 40PSI the pump turned itself back again...
:
: I almost feel like I need a "water capacitor", using kind of electrical
analogy...
: Some flexible device/container which could take the pressure from the
pump
: and release it over time feeding the need for water of the RO filter...
Or a much
: smaller capacity pump which will just barely keep up with RO filter
demand.