What's Your Tds Reading Before Di?

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sirhc13

Guest
As the title says...What tds reading is everyone getting pre DI filter? Mine reads 35 and I'm wondering if thats high?
 
Luke.

Luke.

Distinguished Member
35tds before di is pretty good my ro is 20-40 tds , di should bring it to 0
 
averhoog

averhoog

Member
Mine is around the 300 range before ro. Gets it down to about 20 before di and the di brings it down to 0
 
EricTMah

EricTMah

Aquariums by Design
city comes it anywhere above 150. After sediment, two carbon blocks and ro membrane 3-8tds and zero after di
 
BIGSHOW

BIGSHOW

Super Active Member
Website Affiliate
35 is quite high, that will burn out your DI very quickly. As EricTMah says 3-8 is about normal for most people on City Water.
 
S

sirhc13

Guest
BIGSHOW said:
35 is quite high, that will burn out your DI very quickly. As EricTMah says 3-8 is about normal for most people on City Water.
Click to expand...
Yes i have noticed my di has been depleting much quicker than normal. Dual ro membranes were replaced in Oct and sediment and carbon 2 months ago and look clean. So I assume its the ro membranes that need replacing....thought they should last a lot longer than 8 months! ☹

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S

sirhc13

Guest
Might switch back to 75gpd and only have to replace 1 ro membrane and see if that helps.

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N

NEC

New Member
sirhc13 said:
Yes i have noticed my di has been depleting much quicker than normal. Dual ro membranes were replaced in Oct and sediment and carbon 2 months ago and look clean. So I assume its the ro membranes that need replacing....thought they should last a lot longer than 8 months! ☹

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Click to expand...
Your RO membrane should last 2 years at least if proper care is taken. It could be something else though. Have you tested your water for chloramines or anything? That stuff can rip through an ro membrane easily.

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N

NEC

New Member
Jarrett Eagles said:
What are the best pre filters to buy

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It depends on your needs. If you have chloramines or anything you should buy a carbon block designed for it. Other wise just your standard 5, 1, 0.5 micron carbon block works fine. Same with sediment filters. Smaller micron size removes more gunk but costs slightly more.

If you have 2 carbon blocks run a 5 and then a 1.

Places like Big show and reef supplies carry quality RO products.

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EricTMah

EricTMah

Aquariums by Design
sirhc13 said:
Yes i have noticed my di has been depleting much quicker than normal. Dual ro membranes were replaced in Oct and sediment and carbon 2 months ago and look clean. So I assume its the ro membranes that need replacing....thought they should last a lot longer than 8 months! ☹

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Click to expand...
My membrane is going on 18months and still testing within range.
Double check to see if the membranes are seated correctly so you're not getting blow by.
Also, do you have a gauge to see water pressure going into the membranes?

S8
 
S

sirhc13

Guest
EricTMah said:
My membrane is going on 18months and still testing within range.
Double check to see if the membranes are seated correctly so you're not getting blow by.
Also, do you have a gauge to see water pressure going into the membranes?

S8
Click to expand...
Water pressure is 50psi and i run
1 5 micron sedimemt
1 5 micron carbon
1 0.6 micron carbon
Dual DI

I will check the ro membranes and see if anything changes.

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Josh

Josh

Active Member
Any suggestions on a TDS meter? In the market and i see theres alot of them and they are fairly cheap as well.
 
Pipes

Pipes

Active Member
My TDS is 375 - 380 into RO. RO strips it down to 12 - 14. One question though @sirhc13, You don't have a carbon filter after the membrane do you? I've seen carbon filters add to the TDS. Just a thought.
 
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