How many stages for RODI

[Dcloser12]

Over filtering won't do anything negative other than lower your water pressure, which can always be corrected with a booster pump. Most installations should have one anyway for proper efficiency although you don't need one.

I thought with my 1 microns I was shooting low but .5? I'll be owning those directly!

 

[Woodyman]

I thought with my 1 microns I was shooting low but .5? I'll be owning those directly!

These are the ones I use.

https://spectrapure.com/products/0-...ment-filter-cartridge-10-inch-sf-zz-0-2abs-10
https://spectrapure.com/products/1-micron-carbon-block-filter-10-inch-l-x-2-8-inch-dia-cf-1-10
https://spectrapure.com/products/0-5-micron-carbon-block-filter-10-inch-l-x-2-8-inch-dia-cf-0-5-10
https://spectrapure.com/products/sp...us-99-rejection-ro-membrane-90gpd-mem-sp-0090
DI gets tricky. I have BRS and spectrapure. I've used both and have both on hand. Various types, but..

Currently I am running 3 mixed beds from spectrapure, but those beds aren't listed on the site.

 

[Woodyman]

I thought with my 1 microns I was shooting low but .5? I'll be owning those directly!

This is basically what going down to the 0.5 gets you. Strictly necessary? No. 98(?)% of people are probably fine without it, but if you want the extra polish why not.

Note: Only 0.5 micron carbon block filters remove trihalomethanes, low levels of chloramine, pesticides, volatile organic chemicals and 99.95% of giardia and cryptosporidium cysts.

 

[LeftyReefer]

I started with a 4 stage and then recently added a 5th stage, which was just adding a second carbon block. I barely need a DI stage with my water.

I'm running:
.5 micron sediment filter
5 micron carbon filter (will replace with another .5 or 1 micron in the future)
.5 micron carbon filter
RO
mixed bed DI

triple TDS meter
probe 1 = source water (city water 80 TDS during winter, 100 TDS during summer)
probe 2 between RO and DI
probe 3 product water, post DI.

I don't go through much DI. In fact, I've never had to change my DI yet.
I often get 0 TDS out of my RO membrane, so I'm not sure my DI is even doing anything much of the time. Truthfully, I could probably get by without a DI stage if I had too.

Your really won't know what you need until you get it hooked up and see what you have in your water. Everyone's water is different.