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Coral Vue Hydros

40PSI into RO


TotesMaGoat

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I have 40psi going into my rodi unit. I know 50 is usually considered the lowest optimal, at what psi are you guys adding a booster pump? Ive got a 5 stage brs 75gpd unit

 

ive got 5tds going into the di and 1 coming out. I have a 40 display plus 20 sump, so im thinking ill probably need 2-3 gallons a day at most for topoff so should get me by just fine, but would be nice to make it quicker, also maybe get the tds down to 0? I bought the unit used, but its color changing DI resin and 3/4 still looks good. Getting just over 4:1 waste to clean

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40 is about the bare minimum pressure a RO membrane will operate at. An Aquatec 8800 RO booster would quickly pay for itself in DI savings alone.

Never rely on color changing resins, they are notoriously inaccurate. Get yourself a good handheld TDS meter such as a HM Digital TDS-3, TDS-4TM or AP-1 and use it on a regular basis. You need 3 TDS readings not just 2, tap TDS, RO only TDS and final RO/DI TDS to know how your system is working. Since the RO membrane does 90-98% of the work you really need to have the tap TDS and RO only TDS readings to calculate the rejection rate or removal efficiency. Often a membrane may be performing poorly and the DI is used as a crutch to prop it up, anbd gets expensive in replacements. Raising the pressure from 40 psi to 80 0r even 90-100 psi willmore than double your GPD, up to around 130-150 GPD at 90-100 psi, but better yet the rejection rate will probably go up tremendously. This is important since for every 2% you can increase the rejection rate, such as 96% to 98% etc, you double the life of your DI resin.

 

You want to make treated water in larger batches, say 5-10 gallons or more at a time so the system stays well flushed via the waste line and flow restrictor. Small batches contribute to TDS creep and shorten the DI life. You mean 4:1 waste to clean don't you, not 4 clean and 1 waste?

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thanks for the quick response. Yes i meant waste to clean, sorry. My tap is right about 200 tds and ive got 5 tds coming out of the ro.Very calcium saturated water around here. my total output will be fine i believe even with 40psi, making little more than a gph, but if a pump means I can get that 5tds down lower before the DI. Like I said I still have 1TDS coming out of the rodi and i bought the system used so i am tempted to buy all new filters possibly ro membrane as well.

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thanks for the quick response. Yes i meant waste to clean, sorry. My tap is right about 200 tds and ive got 5 tds coming out of the ro.Very calcium saturated water around here. my total output will be fine i believe even with 40psi, making little more than a gph, but if a pump means I can get that 5tds down lower before the DI. Like I said I still have 1TDS coming out of the rodi and i bought the system used so i am tempted to buy all new filters possibly ro membrane as well.

 

If you bought it used sell it. Try and buy the spectrapure refurb unit. Then buy a booster pump. Pressure is your friend when it comes to RO/DI units.

 

Spectrapure

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If you bought it used sell it. Try and buy the spectrapure refurb unit. Then buy a booster pump. Pressure is your friend when it comes to RO/DI units.

 

Spectrapure

 

All i need is a booster pump, there's nothing wrong with the unit

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Mr. Clownfish

Just wondering how a booster pump would be effected if I'm using a float valve at the other end to shut off the water when my storage tank is full?

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Just wondering how a booster pump would be effected if I'm using a float valve at the other end to shut off the water when my storage tank is full?

most pumps come with a pressure switch

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What he means is the cost of high quality replacement filters, a high rejection rate RO membrane and matched flow restrictor and a new DI cartridge will just about equal the cost of a new Spectrapure reef quality RO/DI.

 

If you have high calcium the absolute best thing you can do for a RO system is install a water softener, RO membranes love soft water since much of the work is already done.

 

If you have an ASOV or auto shutoff valve on your RO/DI you need a Aquatec booster pump with a pressure switch so it shuts off when it senses the ASOV is closed due to a rasied float.

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What he means is the cost of high quality replacement filters, a high rejection rate RO membrane and matched flow restrictor and a new DI cartridge will just about equal the cost of a new Spectrapure reef quality RO/DI.

 

If you have high calcium the absolute best thing you can do for a RO system is install a water softener, RO membranes love soft water since much of the work is already done.

 

If you have an ASOV or auto shutoff valve on your RO/DI you need a Aquatec booster pump with a pressure switch so it shuts off when it senses the ASOV is closed due to a rasied float.

my rejection rate at 40psi is 97.5%, id say membrane is just fine, throw 40$ in for new pre filters/DI resin/CAC and it'll be good to go. I have refillable DI canister. Only spent 60$ on the unit. Live in an apartment so softener is a no go. 200tds pre ro 3tds post ro, even with these used filters with who knows how many gallons through it, is pretty manageable. I think just the DI is spent because its 3 pre di and still coming out at 1tds post, but am replacing everything minus ro membrane for peace of mind. Will have a booster pump on the way soon so I should see my rejection rate come up as well

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