FILL.TER
Exploratory Project (2026)
Why a gravity based filter?
Gravity-based filters operate purely using gravity — no electric power or plumbing needed — making them ideal for indoor and outdoor environments, especially where power reliability is low. Bottle filters rely on user action (sipping, squeezing, pressing), which can limit flow stability and overall volume throughput. Gravity systems can deliver higher flow rates and larger volumes than bottle filters in field conditions.
Pros
Higher volume per cycle
Consistent flow
Hands-off filtration
Good for groups
Cons
Usually larger in footprint
Slower initial setup
Example products
LifeStraw Peak Series Gravity Filter System — simple, multi-stage gravity purifier.
Katadyn BeFree Gravity Filter — popular lightweight option
Sawyer Gravity Water Filtration System
What they remove
Bacteria, protozoa, cysts, sediment, some chemicals (with carbon stage).
Gravity + Bottle Based System
The filter cone, is gravity based, made from recycled polymer to withstand long term water exposure. The top inlet works like a thermos cap, click to open the inlet and filter.
The clean container, could be lined with activated carbon removing residual odors, improving taste and absorbing chemicals.
The container that is fixed on top, is the one that collects the dirty water. Its supposed to act as a reservoir, has a locking mechanism that is silicone lined to prevent water leakage.
Overview
01
Fill.ter is a gravity based water purifier that allows urban millennials (25-30) to purify drinking water efficiently both indoors and outdoors as part of a mobile, sustainability-driven lifestyle in the 2030s, by overcoming the shortcomings of current portable water purifiers and offering a compact, gravity-based, and environmentally responsible solution.
Exploration
01
Basically the idea is to convert a bottle filtering system to a gravity based one. This will allow the entire contraption to be modular, compact and just a better option to use in an indoor setting as well.
Final Designs
01
SAHIL JENA
Sahil Jena
Gravity + Bottle Based System
The filter cone, is gravity based, made from recycled polymer to withstand long term water exposure. The top inlet works like a thermos cap, click to open the inlet and filter.
The container that is fixed on top, is the one that collects the dirty water. Its supposed to act as a reservoir, has a locking mechanism that is silicone lined to prevent water leakage.
The clean container, could be lined with activated carbon removing residual odors, improving taste and absorbing chemicals.
Fill.ter
Exploratory Project
Overview
01
Fill.ter is a gravity based water purifier that allows urban millennials (25-30) to purify drinking water efficiently both indoors and outdoors as part of a mobile, sustainability-driven lifestyle in the 2030s, by overcoming the shortcomings of current portable water purifiers and offering a compact, gravity-based, and environmentally responsible solution.
Exploration
01
Basically the idea is to convert a bottle filtering system to a gravity based one. This will allow the entire contraption to be modular, compact and just a better option to use in an indoor setting as well.
Final Design
02
Basically the idea is to convert a bottle filtering system to a gravity based one. This will allow the entire contraption to be modular, compact and just a better option to use in an indoor setting as well.