Fishkeeping - water vs. water

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- - water vs. water (http://www.fishkeepingbanter.com/showthread.php?t=25183)

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 :-)

"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 :)

"TekCat" wrote in message ...
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?

What is your tap water temperature and how does it match
the nominal temperature required by the membrane manufacturer ?

Wow that's great ! your now getting 5gpd instead of 2gpd!
That RO unit is going got pay for itself in no time !

hehehe

hmmm,, maybe the flow restricters are defective. What kind
of flowrate are you geting from the brine line?

I think I would be calling the manufacture. You might also
chech the flow rate going into the the actual ro part,
just to make sure that it is going through the prefilters
ok. It most likely is, but it could be ruled out, and then
call the manufacture.

Wayne Sallee

TekCat wrote:
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.

My tap water is within normal range for the membrane. I think, it is around
50 - 60.

"Pszemol" wrote in message
...
"TekCat" wrote in message
...
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?

What is your tap water temperature and how does it match
the nominal temperature required by the membrane manufacturer ?

Thanks for humor :))) I needed it :) .... my better half is going to kill me
when she finds out that all that money is wasted...

Anyways, they (who I bought it from) are going to send me another RO
membrane. Just to play around, I hooked up the pump just before the
membrane (after the prefilters)... hm... same ****, different hookup :)

In any case, I'll wait for the replacement membrane.... after that the
flowrestricter is gonna be disected.... meanwhile I am gonna go to LFS and
get some RO water.

Thanks :)

"Wayne Sallee" wrote in message
nk.net...
Wow that's great ! your now getting 5gpd instead of 2gpd! That RO unit is
going got pay for itself in no time !

hehehe

hmmm,, maybe the flow restricters are defective. What kind of flowrate are
you geting from the brine line?

I think I would be calling the manufacture. You might also chech the flow
rate going into the the actual ro part, just to make sure that it is going
through the prefilters ok. It most likely is, but it could be ruled out,
and then call the manufacture.

Wayne Sallee

TekCat wrote:
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.

"TekCat" wrote in message
...
Thanks for humor :))) I needed it :) .... my better half is going to kill
me
when she finds out that all that money is wasted...

I was trying to keep quiet for the duration of this exchange, but the
temptation after this comment is just too great. I have to ask it; Does the
extra $70 bucks look like _that_ much more money now?

Anyways, they (who I bought it from) are going to send me another RO
membrane. Just to play around, I hooked up the pump just before the
membrane (after the prefilters)... hm... same ****, different hookup :)

In any case, I'll wait for the replacement membrane.... after that the
flowrestricter is gonna be disected.... meanwhile I am gonna go to LFS and
get some RO water.

Tick tock tick tock. Be sure to insist that their 15 day replacement policy
take effect from the day the unit starts putting out RO/DI in amounts
remotely approaching its rated daily volume... You shouldn't be the one to
be burned, just for accomodating their efforts at a repair.

DaveZ
Atom Weaver