SimPure Reverse Osmosis Under Sink Water Filter System (Alkaline or Near 0 TDS)

Hamburgerler71

Jan 7, 2026 3:48 PM

564 Comments

Joined Feb 2009

Hamburgerler71Jan 7, 2026 3:48 PM

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Quote from lionnoize

:

Yea cuz calcium, magnesium, and potassium don't do anything right? You should teach us some more

Medical science (SCIENCE) will tell you that your body will regulate the acidity of your body no matter what Gwyneth Paltrow or anyone else on the internet tells you. There is nothing you can ingest that will change the pH of your body as long as you lungs and kidneys are functioning properly. Well that is within reason and not deadly. As far as calcium, magnesium, and potassium, well, they are commonly known as electrolytes and most people consume way more than they need with drinks and supplements. This is causing an increase in kidney stones! Also your liver will detoxify your body not things that make you cry on the toilet. So take the information however you want, but just remember. Even though you think it makes sense and feels good if SCIENCE tells you that you are wrong. YOU ARE WRONG.

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scomp23

Jan 7, 2026 3:49 PM

89 Comments

Joined Sep 2015

scomp23Jan 7, 2026 3:49 PM

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Quote from fieldcar

:

Reverse osmosis (RO) systems remove nearly all dissolved minerals from water, including beneficial ones like calcium and magnesium. This results in water that is very pure but often tastes flat or bland due to the lack of minerals. Additionally, the absence of minerals can make the water slightly acidic, with a pH typically between 5.0 and 6.5.
To improve taste and balance pH, an alkaline filter is added as a final stage in some RO systems. This filter reintroduces essential minerals such as calcium, magnesium, and potassium into the water. Doing so raises the pH to a more neutral or slightly alkaline level (typically 7.0–8.5), enhances flavor, and gives the water a smoother mouthfeel.
In short, the alkaline filter prevents flat water by restoring minerals removed during RO filtration, making the water more pleasant to drink and less acidic.

This is true. People generally will not like the taste of RO water without minerals added back in. I have a Frizzlife under-sink RO system and water that comes out of it is around 3-4 PPM for TDS. That water is then put through a filter to re-mineralize the water and the taste is much better.
Also, for what it's worth, I agree with one of the posts above- I highly recommend tankless if you want to go the under-sink RO filter route.

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DameTime

Jan 7, 2026 3:57 PM

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DameTimeJan 7, 2026 3:57 PM

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Quote from ionz

:

I was thinking of getting a RO system for a saltwater tank. The initial cost looks good but I think reviews complained about the motor failing and filter pricing. Anyone have a recommendation of what they use?

Ive used the APEC water system RO for the past 2 years. The filters are reasonably priced.

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vivekmano

Jan 7, 2026 4:12 PM

12 Comments

Joined May 2013

vivekmanoJan 7, 2026 4:12 PM

12 Comments

Quote from scomp23

:

This is true. People generally will not like the taste of RO water without minerals added back in. I have a Frizzlife under-sink RO system and water that comes out of it is around 3-4 PPM for TDS. That water is then put through a filter to re-mineralize the water and the taste is much better.
Also, for what it's worth, I agree with one of the posts above- I highly recommend tankless if you want to go the under-sink RO filter route.

do you have a recommendation for both the tankless option and to remineralize the water?

Hamburgerler71

Jan 7, 2026 4:20 PM

564 Comments

Joined Feb 2009

Hamburgerler71Jan 7, 2026 4:20 PM

564 Comments

So if I am reading this correctly the whole system is $100 But replacement filters for 1 year are $168. Does anyone know if I can buy more then 1 system with the code or am I limited to just 1? bonus back up pump tank etc.

bobdob

Jan 7, 2026 5:01 PM

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bobdobJan 7, 2026 5:01 PM

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Quote from ionz

:

I was thinking of getting a RO system for a saltwater tank. The initial cost looks good but I think reviews complained about the motor failing and filter pricing. Anyone have a recommendation of what they use?

Don't buy into proprietary crap like this. Stick with standard 10" housings and RO membranes. More configurable to your needs and far cheaper to replace filters.

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TenderHalibut2061

Jan 7, 2026 5:07 PM

188 Comments

Joined May 2021

TenderHalibut2061Jan 7, 2026 5:07 PM

188 Comments

I guess the advantage of the tank is higher flow rate? I'd rather not have to mount another thing under the sink though.
If this ain't it, can someone recommend an under sink system <$300? I'd prefer to pay more up front if cheaper filters are available. Just looking for good drinking water / for the coffee machine, I don't subscribe to the alkaline nonsense, and don't mind a slower flow rate.

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DameTime

Jan 7, 2026 5:27 PM

96 Comments

Joined Jun 2021

DameTimeJan 7, 2026 5:27 PM

96 Comments

Deleted

Last edited by DameTime January 7, 2026 at 09:41 AM.

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BeautifulLake409

Jan 7, 2026 5:28 PM

391 Comments

Joined Jan 2021

BeautifulLake409Jan 7, 2026 5:28 PM

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Quote from bobdob

:

Don't buy into proprietary crap like this. Stick with standard 10" housings and RO membranes. More configurable to your needs and far cheaper to replace filters.

Any suggestions?

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DameTime

Jan 7, 2026 5:41 PM

96 Comments

Joined Jun 2021

DameTimeJan 7, 2026 5:41 PM

96 Comments

Deleted

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riffdex

Jan 7, 2026 7:13 PM

924 Comments

Joined Aug 2012

riffdexJan 7, 2026 7:13 PM

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Quote from Hamburgerler71

:

Medical science (SCIENCE) will tell you that your body will regulate the acidity of your body no matter what Gwyneth Paltrow or anyone else on the internet tells you. There is nothing you can ingest that will change the pH of your body as long as you lungs and kidneys are functioning properly. Well that is within reason and not deadly. As far as calcium, magnesium, and potassium, well, they are commonly known as electrolytes and most people consume way more than they need with drinks and supplements. This is causing an increase in kidney stones! Also your liver will detoxify your body not things that make you cry on the toilet. So take the information however you want, but just remember. Even though you think it makes sense and feels good if SCIENCE tells you that you are wrong. YOU ARE WRONG.

We see marketing claims that alkaline water will neutralize the overall body, and it's often purported as a way of neutralizing stomach acid. These claims are pseudoscience, and promote the false idea that the acidic environment of the stomach that is so vital to digestion need to be eliminated - claims that often sound logical enough to convince some end-consumers.

But you can't look at instances of erroneous claims as evidence that the underlying product itself has no application. Not everybody who is utilizing alkaline water is doing so because they believe it can "alkalize the entire body". It is a very effective as a targeted tool to treat conditions like LPR that results in a build up of pepsin in the upper esophageal tract, serving to neutralize the acids that should not be there, but are, and are causing damage to tissue in the region - with the implication that you are also taking concrete steps to address the underlying dysfunction itself.

The cool thing about Alkaline water is it's strictly speaking a generic term that refers to a water with alkaline properties, which no company (and their erroneous marketing campaigns) has a monopoly on. I produce my own Alkaline water in house at a fraction of the cost of any marketable product, and my utilization of the product is based on my understanding of the underlying chemical science, not any marketing team trying to convince me nonsense about the health benefits they claim their product can offer.

Last edited by riffdex January 7, 2026 at 11:43 AM.

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1-6

Jan 7, 2026 7:17 PM

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Joined Sep 2014

1-6Jan 7, 2026 7:17 PM

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This includes a permeate pump!

TPMJB

Jan 7, 2026 7:43 PM

1.3K Comments

Joined Apr 2015

TPMJBJan 7, 2026 7:43 PM

1.3K Comments

I have an RO filter (not this brand) but it's a game changer for Texas water. The water doesn't have many "contaminants" but a substantial amount of sodium (500ppm). Great for appliances, not great for taste.

Why do none of these advertise hooking up to a refrigerator? I did with mine, and drilled a small hole in the wall to get to the bathroom sink for the waste drain. Much more useful than an extra faucet for your sink.

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cptsoviet

Jan 7, 2026 7:47 PM

92 Comments

Joined Dec 2013

cptsovietJan 7, 2026 7:47 PM

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Quote from BeautifulLake409

:

Any suggestions?

Can vouch for Expresswater kit. Mine's been running great since 2017. The basic one costs $210 and should last for 1 year with jncluded filters.

You can buy 3 year supply of filters for $90 from their website. If your municipal water is not too bad, you can multiply filter life by 2.
https://www.expresswater.com/prod...t?variant=

You may be able to find it a little cheaper at home depot.

I can easily go 2 years on a membrane and as long as I change the prefilters once a year im still under 10ppm.

The $90 3-year kit will last me 6 years easily.

This is a generic kit using off the shelf parts. If you look up "reverse osmosis filter" you will find many results by different brands that all look the same, and you can expect them to work pretty much the same. In most cases the replacement filter kits are interchangeable too, but your mileage may vary.

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Chris_Tian

Jan 7, 2026 8:02 PM

436 Comments

Joined Jul 2020

Chris_TianJan 7, 2026 8:02 PM

436 Comments

Quote from Artc8888

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PLEASE Note the replacement filter will cost you $63 (set) + RO filter ($52)..... also, i prefer to have a clear canister, where I can visually monitor the degradation of the filter....

That's a lot. I purchased over christmas a waterdrop t3-m which has the remineralization filter for $150(waterdrop had them on sale) refurbished with 2yr warranty. Filters for all 3(RO, carbon and Mineralization)are $56 which isnt bad.

SimPure Reverse Osmosis Under Sink Water Filter System (Alkaline or Near 0 TDS)

$100

$199

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