Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
frontpage
Red_Liz | Staff 77K Views
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
Get Deal at Amazon
Good Deal?
90Comments
Save
Share
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
+213
Good Deal

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!

90 Comments

Sign up for a Slickdeals account to remove this ad.

Jul 12, 2026 7:39 PM
371 Comments
Joined Apr 2012
isuzudieselJul 12, 2026 7:39 PM
371 Comments
Quote from RanR6688 View quoted comment :
By comparing with iSpring 6-stage RO water filtration system (costco: https://www.costco.com/p/-/isprin...&langId=-1), which one is better?
Get the RO every time for drinking water. If your budget allows add a whole home system later.
Jul 12, 2026 8:34 PM
30 Comments
Joined Jan 2017
TriviumJul 12, 2026 8:34 PM
30 Comments
Quote from WildRigger47 View quoted comment :
It's senseless to filter the main kitchen sink faucet. The vast majority of water used by the main kitchen sink faucet is for washing or at least rinsing off of dishes, pots, & pans, not drinking water.You should install and use a dedicated smaller 'tube faucet' to connect to the filter system and that way the filters will last 100x longer, as the filters are then filtering only the water that truly needs filtration.
Agreed. It looks like there is a dedicated faucet option for a little bit more.
Jul 12, 2026 8:49 PM
1.3K Comments
Joined Nov 2012
darksiderisingJul 12, 2026 8:49 PM
1.3K Comments
Quote from CommonSalt View quoted comment :
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.
We use ours for our bottle washer, humidifiers, steam mop, and carnivorous plants. There's plenty of use for RO water.
Jul 12, 2026 8:50 PM
1.3K Comments
Joined Nov 2012
darksiderisingJul 12, 2026 8:50 PM
1.3K Comments
Quote from fearziz View quoted comment :
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.
It'll come with a tee that splits the water supply.
Jul 13, 2026 6:13 PM
528 Comments
Joined Nov 2006
joshoowaJul 13, 2026 6:13 PM
528 Comments
I'd like to plumb this to my fridge to have cleaner water for ice and drinking water. Fridge has its own charcoal filter already
Sr. Deal Editor
Jul 13, 2026 8:51 PM
35.6K Comments
Joined Nov 2004
persian_mafia
Sr. Deal Editor
Jul 13, 2026 8:51 PM
35.6K Comments
This deal is still valid
Jul 14, 2026 12:33 AM
283 Comments
Joined Nov 2011
singer07Jul 14, 2026 12:33 AM
283 Comments
Quote from turboc20 View quoted comment :
The cheapest RO is still way better than this.

https://www.apecwater.com/product...h75-detail
This is currently $175
where are you seeing 175?

Sign up for a Slickdeals account to remove this ad.

Jul 14, 2026 2:19 AM
848 Comments
Joined Oct 2014
turboc20Jul 14, 2026 2:19 AM
848 Comments
Quote from singer07 View quoted comment :
where are you seeing 175?
Yes, I saw it being $175 at the time of that post at exactly that URL.
That $175 deal is dead now.
Jul 14, 2026 6:39 PM
113 Comments
Joined Jan 2018
Ryan870Jul 14, 2026 6:39 PM
113 Comments
Quote from stacks3000 View quoted comment :
You dont need the faucet this filters the entire kitchen sink.
As someone said, is not for the hot side. Plus the flow rate on these is faaar too low.
Jul 15, 2026 12:58 AM
7 Comments
Joined Mar 2026
darktalos25Jul 15, 2026 12:58 AM
7 Comments
Not a good filter. It doesn't have an ro membrane or a pressure tank. Hard pass.
Jul 15, 2026 5:33 AM
1.4K Comments
Joined Mar 2016
AudizzzJul 15, 2026 5:33 AM
1.4K Comments
Too expensive
Jul 15, 2026 12:08 PM
1.8K Comments
Joined Nov 2017
FookNoeJul 15, 2026 12:08 PM
1.8K Comments
Nice, the top part of the canister is still plastic, which will likely leak with microscopic pin size hole.
Aug 17, 2026 5:50 AM
238 Comments
Joined Nov 2011
gcbAug 17, 2026 5:50 AM
238 Comments
Quote from turboc20 View quoted comment :
The cheapest RO is still way better than this.

https://www.apecwater.com/product...h75-detail
This is currently $175
I had an apec in my previous place, bought at costco for $100... but researching now, apec has zero certification with NST/ANSI!!! https://listings.nsf.org/certifie...its&q=apec

this waterdrop brand does have several filters certified for ANSI 53 (which is what you want before ANSI 58, which is reverse osmosis, which this filter is not) https://listings.nsf.org/certifie...=Waterdrop


edit: the apec is now almost $300! not 175... also, costco do not sell them anymore (at least near me) they sell the exact same product but from iSpring, which DOES have ANSI certification! (for $199)
Last edited by gcb August 16, 2026 at 11:01 PM.
Aug 17, 2026 5:59 AM
238 Comments
Joined Nov 2011
gcbAug 17, 2026 5:59 AM
238 Comments
Quote from nukemup View quoted comment :
Will use as pre-filter for external ro-only filter.
great idea! tu op.
any real RO already have pre-filtration, because things like chrorine actuall eats the RO membrane!

Sign up for a Slickdeals account to remove this ad.

Aug 20, 2026 2:57 PM
747 Comments
Joined Jun 2003
bradmurrayAug 20, 2026 2:57 PM
747 Comments
The stainless is kind of pointless and you are locked into Waterdrop's overpriced filters for any changes which cost close to the price of this unit. Get an iSpring 3-stage at amazon for about $100 and the filter replacements are about $15 for all three. https://www.amazon.com/dp/B07CHXVRS5

Join The Conversation

Share your experience with the Slickdeals community

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