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Flushing RO/DI after filter change (1 Viewer)

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gregg

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I just swamped out all my filters on my ro/di machine... how long do you let them run/flush before you start using it again? The di has been going so fast lately that I don’t wanna waste a drop flushing it longer than I should.
 
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gregg

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Maybe the word “flushing” is the wrong term. Once I swamp out my filters aren’t I supposed to diss guard a certain amount of produced product before I start capturing it in my storage tank?
 

mikster

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Yes that is correct but none of that water is supposed to go through your DI resin. It should go through the Prefilter, Carbon filters and membrane then waste water. Your DI water should be closed off at this point and only open when you are trying to fill up for DI water.
 

RR-MAN

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Maybe the word “flushing” is the wrong term. Once I swamp out my filters aren’t I supposed to diss guard a certain amount of produced product before I start capturing it in my storage tank?

I throw away the first 2-4 gallons it produces after the filter change.
 

Cody

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I throw away the first 2-4 gallons it produces after the filter change.
If it's producing 0ppm TDS then who cares. Flush it a little to get any gunk off then let those fresh puppies do what they were made to do.
 

mikster

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I usually flush for 5 mins since I need to periodically flush my membrane anyway
 

mittens

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Per Spectrapure

Flushing Filters

Some filters should be flushed when first installed. “Flushing” is no more complicated than running water through the filter without delivering the flush water to other stages in your water purification system.

Hint: An easy way to flush new filters is to temporarily install it as the final stage in your system and allow the flush water to go to a drain.

Sediment Filters No need to flush sediment filters unless otherwise specified on the filter label.

Carbon Blocks: Manufacturers recommend flushing carbon block cartridges for at least 10 minutes.

RO Membranes: Manufacturers recommend flushing at least 5 gallons of water through new dry RO membranes to remove preservatives before using the product water. Don’t run flush water through later stages in your system, run it all down the drain. SpectraSelect Membranes don’t need to be flushed since they already have been flushed.

DI Resin: SEE BELOW vvvv (replacement of filters)

Replacement of filters

Put the sediment and carbon in first. Leave DI housing(s) empty. Run a gallon of water through the empty DI housing(s). Add the MegaMaxCap cartridge. Run it until the TDS IN on the right meter reads 0. Add the Enduro DI, Run it until the TDS OUT on the right meter reads 0. Once complete your system is good to go.

A Sediment/Carbon Filter will usually last approx. 4-6 months, depending on the quality of the tap water and quantity of water being produced. The best way to determine when your Sediment/Carbon Prefilter needs replacement is to monitor the Pressure Gauge. When you have a drop in pressure of 15-20% below your normal gauge pressure, replace the filter. To verify this, run water through the system without the filter in its housing. If the pressure returns to your normal house pressure without the filter, you will know the filter you just took out was plugged up and causing the pressure drop.

Sediment: The best way to know when the sediment is in need of replacement is by using the pressure gauge, when pressure drops your sediment filter is going bad. Replace it when you get a 15% pressure drop! (example; I have 60 PSI, after much use my PSI is now 48 PSI. That’s a 20% pressure drops! Your flow rate will slow down and your carbon will start doing some heavy work by taking our sediment.

Carbon: Use our Chlorine Test Kit (https://spectrapure.com/Total-Chlorine-Test-Kit-w-10-tablets&filter_name=chlroine) to test the chlorine levels going to your membrane. This test will tell you when to change your carbon block ( or you can change it every 6 months) but by using this Chlorine test kit, you can get an estimate of how long your carbons will last with your water. If you’re on a well, you probably don’t have much or any chlorine and can get a longer life of the carbon blocks. If you’re on city water then chlorine levels can be between .5 to 4.0 which will vary if the life of your carbon block.

Use these two methods for pre-filters and you’ll be set. After 1700 gallons of processed water (6800 total gallons through the system), the prefilters could be plugging up.

Membrane: Replace the membrane when rejection rate is less than 96% or if production comes to a halt. Use the calculator below (Membrane Rejection Calc) to figure out your rejection!

**Rule of thumb with the MaxCap and Silicabuster(MegaMaxCap and Enduro) (this will save you $$$ too)**

Once you replace your filters, keep an eye on the LEFT TDS METER - OUT reading and your RIGHT TDS METER - IN reading. This is essentially your POST membrane RO water and the MegaMaxCap DI ppm going into your Enduro DI.

Once your RIGHT TDS METER – IN reading is HALF of your LEFT TDS METER - OUT reading, you can replace the MegaMaxCap DI but your Enduro should still be putting out 0ppm water. You can essentially change the MegaMaxCap DI 2-3 times before needing to change your Enduro
.
Example; your LEFT TDS METER - OUT reading is 10. Once your RIGHT TDS METER - IN shows 5, change the MegaMaxCap. You should be able to do this 2-3 times before needing to change the Enduro.



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Yes that is correct but none of that water is supposed to go through your DI resin. It should go through the Prefilter, Carbon filters and membrane then waste water. Your DI water should be closed off at this point and only open when you are trying to fill up for DI water.

Yeah, flushing does not affect DI stage.
 
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When I flush it goes through my sediment and carbon block and into my washer drain. When I start it up, I have a 3-way John Guest ball valve that I switch over to allow the first 2-3 minutes of water go down the drain. Then I switch it over and send it through my DI. My last DI resin lasted 6+ months. I made a lot of water QTing fish....so this one should last about 9 months or more. :mwave:
 
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