R/O booster pump and asov question

[Bigcefa]

I just set up a new kent 50gpd r/o for a customer just for ato purposes. so the problem is even while the float is down in off posistion the r/o machine keeps rejecting water. im assuming that there isnt enough pressure from the source water to trigger it to shut down, i have no way of knowing for sure as their is no pressure valve so... Im looking into getting her a booster pump, ive never had to intall one as ive never run into a low pressure issue or a r/o that constantly rejects water. My question is with the booster installed with a auto shutoff valve on it, when the float is down and booster turns off will the source water keep running in and in turn not solve the rejection problem? my plan is just to put the pump in line right from the source to the sediment input. my only other thought is maybe all the flow restrictor kent puts on their machine could cause this but i doubt it. So if anyone could help with the problem of the machine keep running waste water with the float down id appreciate it or maybe someone has another solution thanks guys.

[tkeracer619]

An ASOV will work at any pressure. That is not your problem. Probably just a bad ASOV or possible one that is installed wrong.

[Bigcefa]

i assumed that r/o machines have a asov built into them so they stop producing water when the float switch if off?

[tkeracer619]

Most of them look like this but they are external and most RO units do not come with one unless specified.

[tkeracer619]

Also, you seem to be interchanging float switch and float valve. They are not the same.

A float valve is simply a float that presses a valve and shuts off flow. A switch is electronic that controls a remote solenoid valve.

A float valve is great when combined with an ASOV. Unfortunately it is bad on the unit to short cycle which is what will happen when it is directly connected to say the sump. To combat this add a solenoid valve on the line running to the tank and activate that with a timer. Regardless of water level the unit will only top off when the timer says to and when the tank is full the float valve and asov will shut it down.

RO units do not produce low tds water when they first start up. If the float is the only means of turning on and off the flow in the sump it will only allow the unit to turn on for a few minutes at a time many times throughout the day. You want the RO to turn on once per day and top the tank off in one session. This will extend the life of the membrane and produce a lower tds water source for your customer.

[Bigcefa]

right i know the difference, that looks like it might work thanks. this machine doesnt have that, first time using the kent r/o machine i use brs one on my tank never had these issues

[tkeracer619]

Yea thats your issue. They also need a one way check valve to operate properly so make sure to order one of those as well.

Also, I was editing the previous post. It now contains some more info. Bad habit

[Bigcefa]

Ya it's hooked up to a float valve I'll have to do some research I guess

[tkeracer619]

Feel free to ask any questions you might have.

[Bigcefa]

What is that fitting called is it available at home depot or do I need to order one