Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
frontpageRed_Liz | Staff posted Jul 6, 2026 12:57 PM

Waterdrop Stainless Steel TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter System

$135

$190

28% off
+ Free S&Hat Amazon
71.7K Views
Get Deal at Amazon
Deal Details
Update: This popular deal is still available.

Waterdrop Filtration Tech via Amazon has Waterdrop Stainless Steel TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter System (Direct Connect to Faucet) for $141.99 - $7.10 w/ promo code D66NHQGW at checkout = $134.89. Shipping is free.

Note: Promo codes are typically for one-time use and don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page. If using the Amazon app, make sure to hit the arrow that appears in the promo code box to apply the code (before tapping the Continue button).

Thanks to Staff Member Red_Liz for sharing this deal.

Product Description:
  • Easy DIY Compatibility: Designed for standard under-sink cold-water connections and municipal tap water. No additional faucet is included
  • Fast And Stable Water Flow: With a flow rate of up to 1.59GPM, this under sink water filter fills up an 8-ounce cup in just 2.3 seconds.
  • Long Filter Life And More Good For The Environment: The PP filter goes strong for 6-8 months, the UF filter for a year, and the CT filter for 12-24 months.
  • Filters Large Volume Of Substances: This system has 6 layers of top-notch filter materials, including a precision ultrafiltration membrane that can reduce impurities larger than 0.01 microns.
  • Multiple Placement Options: Stick it on the floor or hang it on the wall. And if you're short on space, slap it right onto your faucet without any extra drilling
  • This under sink water filtration system will retain some beneficial minerals for our bodies, such as potassium, calcium, sodium, and magnesium.

Editor's Notes

Written by persian_mafia | Staff
  • About this Deal:
    • Our research indicates that this is $65.10 lower (32.6% savings) than the next best available price from a reputable merchant with prices starting from $199.99 at the time of this post.
    • While supplies / offer lasts.
    • Please see the original post for additional details and give the WIKI and forum comments a read for helpful discussion.
  • About this Store:

Original Post

Written by Red_Liz | Staff
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Update: This popular deal is still available.

Waterdrop Filtration Tech via Amazon has Waterdrop Stainless Steel TST-UF 0.01μm Ultra-Filtration Under Sink Water Filter System (Direct Connect to Faucet) for $141.99 - $7.10 w/ promo code D66NHQGW at checkout = $134.89. Shipping is free.

Note: Promo codes are typically for one-time use and don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page. If using the Amazon app, make sure to hit the arrow that appears in the promo code box to apply the code (before tapping the Continue button).

Thanks to Staff Member Red_Liz for sharing this deal.

Product Description:
  • Easy DIY Compatibility: Designed for standard under-sink cold-water connections and municipal tap water. No additional faucet is included
  • Fast And Stable Water Flow: With a flow rate of up to 1.59GPM, this under sink water filter fills up an 8-ounce cup in just 2.3 seconds.
  • Long Filter Life And More Good For The Environment: The PP filter goes strong for 6-8 months, the UF filter for a year, and the CT filter for 12-24 months.
  • Filters Large Volume Of Substances: This system has 6 layers of top-notch filter materials, including a precision ultrafiltration membrane that can reduce impurities larger than 0.01 microns.
  • Multiple Placement Options: Stick it on the floor or hang it on the wall. And if you're short on space, slap it right onto your faucet without any extra drilling
  • This under sink water filtration system will retain some beneficial minerals for our bodies, such as potassium, calcium, sodium, and magnesium.

Editor's Notes

Written by persian_mafia | Staff
  • About this Deal:
    • Our research indicates that this is $65.10 lower (32.6% savings) than the next best available price from a reputable merchant with prices starting from $199.99 at the time of this post.
    • While supplies / offer lasts.
    • Please see the original post for additional details and give the WIKI and forum comments a read for helpful discussion.
  • About this Store:

Original Post

Written by Red_Liz | Staff

Community Voting

Deal Score
+210
Good Deal
Get Deal at Amazon

Top Comments

Join The Conversation

Share your experience with the Slickdeals community

Share information with the community. Please follow our Community Guidelines and be kind!

87 Comments

Sign up for a Slickdeals account to remove this ad.

Jul 10, 2026 4:37 PM
207 Comments
Joined Aug 2006
korgJul 10, 2026 4:37 PM
207 Comments
This doesn't seem any better than their single filter under sink systems such as https://www.amazon.com/Waterdrop-...B08GX6BYMW

The three stage filter here has a polypropylene filter, the ultrafiltration filter, and a carbon black filter. The single filter unit has the same and lasts longer as well. Seems to make more sense to get the single filter unit, and only get a multi filter if you get an actual RO unit.
Jul 10, 2026 5:35 PM
1.7K Comments
Joined Sep 2011
SoukaJul 10, 2026 5:35 PM
1.7K Comments
might give it a shot
Jul 10, 2026 5:52 PM
2.3K Comments
Joined Mar 2005
squandererJul 10, 2026 5:52 PM
2.3K Comments
doesn't look like it uses regular filters...how much are the replacement filters?
Jul 10, 2026 11:24 PM
684 Comments
Joined Sep 2009
fearzizJul 10, 2026 11:24 PM
684 Comments
do you need a separte water line to use to effectively under the sink? I don't want to purify dish water. I use a primo water dispenser now.
Jul 11, 2026 12:17 AM
190 Comments
Joined Sep 2011
goyashJul 11, 2026 12:17 AM
190 Comments
no RO membrane, this looks to be a 3 stage particulate water filter
Jul 11, 2026 2:42 AM
45 Comments
Joined Jan 2021
nukemupJul 11, 2026 2:42 AM
45 Comments
Quote from euhenius :
I replaced mine after it blew after 2 years of use.
"it blew" .. what a crock. what is "IT"? RO has 3 cylinders prefilters connected by tubes. How can "it" blew up? What, some tubes disconnected?
Jul 11, 2026 3:00 PM
405 Comments
Joined Oct 2004
EnikeJul 11, 2026 3:00 PM
405 Comments
Thanks

Sign up for a Slickdeals account to remove this ad.

Jul 11, 2026 3:16 PM
1.2K Comments
Joined Jul 2003
MacrolordJul 11, 2026 3:16 PM
1.2K Comments
Quote from Egotiator :
It's not an RO system, but in exchange, it has a higher flow rate and doesn't need a drain. Won't taste as good, but better than a regular filter. Could use it for the cold water on your sink/dishwasher, or (with modification) a very overpowered inline fridge filter so you can bypass the manufacturer filters (filter plugs are normally free if you ask for one). But for drinking water, and under your sink, an RO system really is the best.
Dishwasher should be connected to the hot side only.
Jul 11, 2026 5:26 PM
149 Comments
Joined Feb 2022
CommonSaltJul 11, 2026 5:26 PM
149 Comments
Quote from 4951cc :
Not quite, this isn't supposed to be an RO filter. This has a much higher flow rate and it isn't as fickle. In my area TDS isn't a huge issue and the installation appears cleaner from a counter top perspective. I still keep a Zero pitcher, but this is plenty some folks.
If your TDS is low, then there's no value in a system like this, anyway. You don't need to filter something if there's nothing to filter out of it.
1
Jul 11, 2026 11:44 PM
1.5K Comments
Joined Feb 2023
oasisallureJul 11, 2026 11:44 PM
1.5K Comments
no tank
Jul 12, 2026 1:34 AM
222 Comments
Joined Jan 2005
Douche_NutzJul 12, 2026 1:34 AM
222 Comments
The stainless steel marketing on this is such a scam. The deception in that clearly shows this is not a good deal.
Jul 12, 2026 1:58 AM
2.1K Comments
Joined Nov 2016
androsskingJul 12, 2026 1:58 AM
2.1K Comments
Quote from JollyHose932 :
Get an RO with a mineral filter. Best water period. Spend the extra on a waterdrop RO.
I agree but some people don't have electricity to run and extra space too
Jul 12, 2026 3:56 AM
654 Comments
Joined Apr 2018
TalentedDesk7409Jul 12, 2026 3:56 AM
654 Comments
Just get a decent RO from eBay
Jul 12, 2026 4:42 AM
106 Comments
Joined Mar 2014
RanR6688Jul 12, 2026 4:42 AM
106 Comments
By comparing with iSpring 6-stage RO water filtration system (costco: https://www.costco.com/p/-/isprin...&langId=-1), which one is better?

Sign up for a Slickdeals account to remove this ad.

Jul 12, 2026 1:34 PM
68 Comments
Joined Jul 2017
jodamythJul 12, 2026 1:34 PM
68 Comments
Quote from stacks3000 :
You dont need the faucet this filters the entire kitchen sink.
A lot of sinks, most new ones in the USA anyway, have one handle that does hot and cold. This does not filter the hot side so you are mixing unfiltered hot every time unless you have 2 separate handles.
1

Join The Conversation

Share your experience with the Slickdeals community

Share information with the community. Please follow our Community Guidelines and be kind!

Popular Deals

Trending Deals