Item 1 of 6
Item 1 of 6
expiredRed_Liz | Staff posted Mar 25, 2026 4:15 PM
Waterdrop G2 7 Stage 400 GPD Reverse Osmosis Water Filter System
$187
$300
37% off
+ Free S&Hat Amazon
Heads up, this deal has expired. Want to create a deal alert for this item?
+ Free S&Hat AmazonDeal Details
Update: This popular deal is still available.
WaterdropDirect via Amazon has Waterdrop G2 7 Stage 400 GPD Reverse Osmosis Water Filter System (WD-G2-W) on sale for $199 - $11.95 when you apply promo code G2WAAERM at checkout = $187.05. Shipping is free.
WaterdropDirect via Amazon has Waterdrop G2 7 Stage 400 GPD Reverse Osmosis Water Filter System (WD-G2-W) on sale for $199 - $11.95 when you apply promo code G2WAAERM at checkout = $187.05. Shipping is free.
- Note: You must be logged in to apply promo codes; 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.
Editor's Notes
Written by qwikwit | Staff- This offer is $92.94 lower (33% savings) than previous Front Page deal that earned 57+ thumbs up.
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
- Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Update: This popular deal is still available.
WaterdropDirect via Amazon has Waterdrop G2 7 Stage 400 GPD Reverse Osmosis Water Filter System (WD-G2-W) on sale for $199 - $11.95 when you apply promo code G2WAAERM at checkout = $187.05. Shipping is free.
WaterdropDirect via Amazon has Waterdrop G2 7 Stage 400 GPD Reverse Osmosis Water Filter System (WD-G2-W) on sale for $199 - $11.95 when you apply promo code G2WAAERM at checkout = $187.05. Shipping is free.
- Note: You must be logged in to apply promo codes; 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.
Editor's Notes
Written by qwikwit | Staff- This offer is $92.94 lower (33% savings) than previous Front Page deal that earned 57+ thumbs up.
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
- Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
Community Voting
Deal Score
+158
Good Deal
Bad Deal
Found by ItsSoCheap
Forum Thread
78% off
Found by Immortalsolitude
Forum Thread
40% off
Found by hawkblu09
Forum Thread
52% off
Found by phoinix
Forum Thread
45% off
Found by Immortalsolitude
Forum Thread
26% off
Found by Slick_Drone
Forum Thread
89% off
Found by phoinix
Forum Thread
41% off
Found by GoldenGhetto
Forum Thread
Top Comments
https://a.co/d/0iPvKZBq
Join The Conversation
Share your experience with the Slickdeals community
Share information with the community. Please follow our Community Guidelines and be kind!
142 Comments
Sign up for a Slickdeals account to remove this ad.
https://a.co/d/0iPvKZBq
They are. one of them is liek $40 and another i believe is $95. The good news? I haven't replace a filter and my unit still spits out 12 TDS/PPM water. so unless you're using an insane amount of water, i think the filters will last you awhile. When i installed my unit, I put a $20 inline TDS meter so i can see what it's spitting out. Here [amazon.com].
Our community has rated this post as helpful. If you agree, why not thank Punker1234
Sign up for a Slickdeals account to remove this ad.
Our community has rated this post as helpful. If you agree, why not thank HonestManatee6623
https://a.co/d/0iPvKZBq
Also, the G2 is NOT NSF/ANSI Standard 58 certified, which means it does not remove fluoride as much as the certified units, maybe ~85-95%. To reach that 1:1 drain ratio, the G2 likely uses a "looser" membrane or operates at a pressure where it doesn't reject quite as many ions as a 2:1 system would - this is the compromise.
The Waterdrop G5P500 is 500 gallons per day (vs G2 400 GPD) and NSF/ANSI Standard 58 certified, but has a 2:1 drain ratio at a similar price point:
https://a.co/d/0fqFrGxw
If I could do it over, I would go for 100% flouride free drinking water over the 1:1 ratio - unless I lived in California, of course.
https://a.co/d/0iPvKZBq
a lot of water filters do not
there's also a website that rates or certs water filters too
Sign up for a Slickdeals account to remove this ad.
Our community has rated this post as helpful. If you agree, why not thank teddebee
Join The Conversation
Share your experience with the Slickdeals community
Share information with the community. Please follow our Community Guidelines and be kind!