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Tankless RO systems skip the pressurized storage tank entirely, so you get filtered water on demand without dedicating cabinet space to a bulky reservoir, which makes this a practical fit for smaller kitchens or tight under-sink setups. At $154, that's $37 off the $191 list price. Buy Now at Amazon

A transparent housing lets you check filter condition without disassembling anything, which is useful if you're building or maintaining a whole-house or under-sink filtration setup. At $39, that's about $2 off the $41 list price. Buy Now at Amazon

A whole house filter system worth considering if your water has sediment, heavy metals, or chemical taste issues, since the polyphosphate filter stage also helps reduce scale buildup in pipes and appliances. At $304, that's about $87 off the $391 list price. Buy Now at Amazon

Households on well water or municipal supplies with sediment and chlorine taste issues are the main candidates for a whole house system like this, since it filters at the point of entry rather than just one tap. At $184, that's about $54 (23%) off the $238 list price. Buy Now at Amazon

A whole house filtration system handles sediment, chlorine, and other contaminants at the point of entry, so every tap in your home gets filtered water, not just the kitchen sink. At $170, that's about $30 off the $199 list price. Buy Now at Amazon

Anyone tired of buying bottled water or lugging a pitcher filter around will appreciate this one, since it hooks straight onto your existing faucet for filtered water on demand. It's a solid option for renters or anyone who wants better-tasting tap water without installing a whole under-sink system. Buy Now at Walmart

Designed to filter sediment and iron/manganese from your water supply before it reaches any faucet in your home, this two-stage whole house system suits well water users or anyone dealing with discoloration or metallic taste. At $191, that's about $37 off the $228 list price. Buy Now at Amazon

Anyone maintaining an iSpring reverse osmosis system will want these on hand, since replacing the filters on schedule keeps your water tasting clean and protects the more expensive membrane down the line. Buy Now at Amazon

This 6-stage RO system adds an alkaline remineralization stage on top of standard filtration, which matters if you're specifically trying to offset the acidity that reverse osmosis water is known for. At $200, it's $80 (29%) off the $280 list price. Buy Now at Amazon

This two-stage system is built for RVs and boats, filtering sediment and chlorine so tap water tastes better on the road, and it's currently $90 off the list price at Amazon. Buy Now at Amazon

A high-capacity commercial RO system like this suits small restaurants, labs, or office buildings that need a continuous supply of filtered water without the footprint of a storage tank. At $2,314, that's about $181 off the $2,495 list price. Buy Now at Amazon

Designed for RVs and other mobile setups, this two-stage system filters sediment and chlorine before water reaches your taps, which matters if you're regularly connecting to unfamiliar hookups. At $299, that's roughly $51 off the $350 list price. Buy Now at Amazon

Filters out contaminants through five stages of reverse osmosis and then runs the water through a UV sterilizer to handle bacteria and viruses, which makes it worth considering if your household has well water or you want an extra layer of treatment beyond standard RO. At $295, that's around $95 off the $390 list price. Buy Now at Amazon

Whole-house UV filtration handles bacteria and viruses without chemicals, making this a solid pick if your water supply comes from a well or you've had contamination concerns. At $400, that's $100 (20%) off the $500 list price, and the 13 GPM flow rate supports typical household demand without a drop in water pressure. Buy Now at Amazon

Designed for homes with well water or older pipes where lead, iron, and manganese are a concern, this whole-house system filters at the point of entry so every tap in your home gets treated water. At $366, that's about $84 off the $450 list price. Buy Now at Amazon

Anyone maintaining an iSpring reverse osmosis system will want these on hand for scheduled filter swaps, and they're currently $3.31 off the $17.43 list price. Buy Now at Amazon

Households on well water or municipal supplies with contaminant concerns will get the most out of this system, since it's built specifically to target PFAS along with sediment and chlorine. At $408.65, that's about $91 off the $500 list price. Buy Now at Amazon

This wrench fits iSpring's WGB series housings, so it's a useful pickup for anyone already running that filtration system and needing an easier way to twist canisters open during filter changes. It's priced at $10.65, about $7 below the $18 list price. Buy Now at Amazon

Handy for anyone on well water dealing with sand or sediment buildup, this filter attaches ahead of your main water filtration system and flushes clean without replacing cartridges. It's currently $19 off the list price at $174.59. Buy Now at Amazon