DI cartridge life span?
- Thread starter Capsle
- Start date
You need to take a reading of the TDS leaving the RO membrane to be sure it is functioning properly. At a minimum your RO membrane should be removing 95% of the dissolved solids after its been running for a minute, so your exiting TDS from the RO membrane should be at the highest 15ppm. On a side note you will get a lot more use out of your DI resin if you run two canisters of resin in series. When you use a single canister of resin and you start to see your TDS readings rise you need to replace the resin even though it still capable of absorbing more pollutants. If you use two canisters when you first start to see your TDS rise, remove the first canister in line and then shift the number two canister into the number one position. Then replace the resin in the old number one canister and place it in the number two position. That way you get full use of the resin.
hkgar
Active member
If your TDS out of the DI why do you think it is 1/2 used up? Continue to monitor it an
d replace when it reads 1, but in the meantime let's see just how long it does last. You might consider one of these:
http://www.bulkreefsupply.com/dual-inline-tds-meter-dm-1-hm-digital.html
d replace when it reads 1, but in the meantime let's see just how long it does last. You might consider one of these:
http://www.bulkreefsupply.com/dual-inline-tds-meter-dm-1-hm-digital.html
vhuang168
New member
You should also look into an RO flush kit. When water sits inside the membrane, there is TDS creep. So the 1st bit of water coming out of the membrane is pretty high (for post membrane) TDS which will use up your DI faster. So if you make small amounts like 2 gallons frequently, the DI will wear out very fast.
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Capsle
New member
It's a new setup, got my salt mixed and now my live rock and sand are in. I will need about another 20g to fill all the way.
Just waiting for the sandstorm to pass now. It might take a few days b
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Capsle
New member
What do you mean?
Ron Reefman
Active member
You really need to take a water sample at the RO membrane exit. If it's working properly your TDS should be quite low. But if it's not working properly the TDS will be high and the expensive DI is doing all the work to get down to zero... and using up the DI way too fast!
if you have a waste water and clean water line switched it will eat through your DI quickly.
Capsle
New member
I just measured everything and checked lined. They look good.
Into sediment cartridge 220 ppm
Out from carbon in to RO 2 180 ppm
Out from RO 80 ppm.
The RO membrane doesn't seem to be doing much, is that normal? I just took the filters out see below.
1- sediment
2- carbon 1
3- carbon 2
4- hose connections.
I've done about 65-70 gallons of RO /DI now.
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Into sediment cartridge 220 ppm
Out from carbon in to RO 2 180 ppm
Out from RO 80 ppm.
The RO membrane doesn't seem to be doing much, is that normal? I just took the filters out see below.
1- sediment
2- carbon 1
3- carbon 2
4- hose connections.
I've done about 65-70 gallons of RO /DI now.
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hkgar
Active member
You may need to set up another sediment filter. The color of the sediment filter after only 70 gallons is very yellow. Maybe a very high iron content in the water. Your output after RO should be no more than 5% of your TDS of your tap water. In your case 220 and no more than 11 output. My output after RO is 2 and my input water is 336. I use a high deficiency Spectrapure RO filter.
Seriously, the water from the membrane should be 5-10 percent of the tap water. When you get 10 percent its time for a new membrane. If chlorine is getting through to your RO it will deteriorate it. Do you have chloramines? You'll need carbon blocks specifically made to remove them.
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