diff --git a/README.md b/README.md
index 6afa35e..18a8fa4 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,31 @@
-# de1-water-tracker-plugin
-A plugin for the Decent Espresso DE1 machine that tracks water and filter replacement date
+# RO Filter Monitor Plugin
 
-Basically you should be entering a date in the settings to track your filter.
-You can also hit the reset button and will auto populate with todays date. 
+A plugin for the Decent Espresso DE1 machine that monitors RO (Reverse Osmosis) filter usage and reminds you when it's time to change your filter.
 
-To-do:
- - Add a ping to let you know when a set total L/gal has been reached for filter change
- - Add a 2 months, 3 months, 6 months, and year selection for time based notifs
+Track your water consumption and get timely notifications to ensure optimal water quality for your espresso.
 
-Thank you Damian for some sanity checks and question answering. 
+## Features
+- Track total water usage in liters or gallons
+- Set a filter change date to track how long your current filter has been in use
+- **Get notified when you reach a water usage threshold** - Set your desired threshold in the plugin settings and you'll receive a notification when it's time to change your filter
+- Reset counter when you change your filter to start tracking the new one
+
+## Usage
+1. Set your preferred units (L or gallons)
+2. Enter the date you last changed your RO filter
+3. Set a filter change reminder threshold (e.g., 100L or 26gal based on your filter's capacity)
+4. The plugin will track your water usage and notify you when the threshold is reached
+5. When you change your filter, hit "Reset Counter" to start tracking again
+
+## Installation
+1. Copy the `ro_filter_monitor` directory into your DE1 plugins folder
+2. Enable the plugin in your DE1 settings
+3. Configure your filter change settings
+
+## To-do
+- Add time-based notifications (2 months, 3 months, 6 months, 1 year options)
+- Support for multiple filter stages
+
+---
+
+Thank you Damian for some sanity checks and question answering.
diff --git a/filelist.txt b/filelist.txt
new file mode 100644
index 0000000..2314159
--- /dev/null
+++ b/filelist.txt
@@ -0,0 +1,2 @@
+plugin.tcl
+settings.tdb
diff --git a/plugin.tcl b/plugin.tcl
index a83cf0e..e941fed 100644
--- a/plugin.tcl
+++ b/plugin.tcl
@@ -1,38 +1,70 @@
-set plugin_name "de1_water_tracker_plugin"
+set plugin_name "ro_filter_monitor"
 
 namespace eval ::plugins::${plugin_name} {
-    variable plugin_name "de1_water_tracker_plugin"
     variable author "Sy_Butter"
     variable contact "Github"
-    variable version 0.1
-    variable description "Track total water usage to help schedule filter changes."
-    variable name "Water Usage Tracker"
+    variable version 0.2
+    variable description "Monitor RO filter usage and get notified when it's time to change your filter."
+    variable name "RO Filter Monitor"
     variable settings
 
     proc build_ui {} {
         variable settings
-        set page_name "plugin_water_tracker_page_default"
+        set page_name "plugin_ro_filter_monitor_page_default"
 
         add_de1_page "$page_name" "settings_message.png" "default"
         add_de1_text $page_name 1280 1310 -text [translate "Done"] -font Helv_10_bold -fill "#fAfBff" -anchor "center"
-        add_de1_button $page_name {say [translate {Done}] $::settings(sound_button_in); page_to_show_when_off extensions} 980 1210 1580 1410 ""
+        add_de1_button $page_name {say [translate {Done}] $::settings(sound_button_in); ::plugins::ro_filter_monitor::save_and_close} 980 1210 1580 1410 ""
 
-        add_de1_text $page_name 1280 300 -text [translate "Water Tracker"] -font Helv_20_bold -width 1200 -fill "#444444" -anchor "center" -justify "center"
+        add_de1_text $page_name 1280 300 -text [translate "RO Filter Monitor"] -font Helv_20_bold -width 1200 -fill "#444444" -anchor "center" -justify "center"
 
-        add_de1_variable $page_name 1280 600 -font global_font -width 800 -fill "#444444" -anchor "center" -textvariable {$::plugins::de1_water_tracker_plugin::settings(display)}
+        # Left column - Volume/Settings
+        add_de1_variable $page_name 680 500 -font global_font -width 600 -fill "#444444" -anchor "w" -textvariable {$::plugins::ro_filter_monitor::settings(display_volume)}
 
-        dui add entry $page_name 1280 760 -tags filter_date -width 12 -font Helv_10 \
+        dui add entry $page_name 680 740 -tags filter_threshold -width 12 -font Helv_10 \
             -borderwidth 1 -bg #fbfaff -foreground #4e85f4 -relief flat \
             -highlightthickness 1 -highlightcolor #000000 \
-            -textvariable ::plugins::de1_water_tracker_plugin::settings(filter_change_date) \
-            -label [translate "Filter Last Changed Date"] -label_pos {1280 700} \
-            -label_font Helv_10_bold -label_width 1200 -label_fill "#444444" -label_anchor center
+            -textvariable ::plugins::ro_filter_monitor::settings(filter_threshold_display) \
+            -label [translate "Filter change reminder (L or gal)"] -label_pos {680 680} \
+            -label_font Helv_10_bold -label_width 1200 -label_fill "#444444" -label_anchor w
 
-        dui add dcheckbox $page_name 1280 860 -tags use_gallons -textvariable ::plugins::de1_water_tracker_plugin::settings(use_gallons) -fill "#444444" \
-            -label [translate "Display in gallons"] -label_font Helv_10_bold -label_fill #4e85f4 -command ::plugins::de1_water_tracker_plugin::toggle_units
+        dui add dcheckbox $page_name 680 820 -tags use_gallons -textvariable ::plugins::ro_filter_monitor::settings(use_gallons) -fill "#444444" \
+            -label [translate "Display in gallons"] -label_font Helv_10_bold -label_fill #4e85f4 -command ::plugins::ro_filter_monitor::toggle_units
 
-        add_de1_text $page_name 1280 1000 -text [translate "Reset Counter"] -font Helv_10_bold -fill "#4e85f4" -anchor "center"
-        add_de1_button $page_name ::plugins::de1_water_tracker_plugin::reset_counter 980 970 1580 1070 ""
+        # Right column - Filter/Actions
+        add_de1_variable $page_name 1480 500 -font global_font -width 600 -fill "#444444" -anchor "w" -textvariable {$::plugins::ro_filter_monitor::settings(display_filter)}
+
+        dui add entry $page_name 1480 740 -tags filter_date -width 12 -font Helv_10 \
+            -borderwidth 1 -bg #fbfaff -foreground #4e85f4 -relief flat \
+            -highlightthickness 1 -highlightcolor #000000 \
+            -textvariable ::plugins::ro_filter_monitor::settings(filter_change_date) \
+            -label [translate "Filter Last Changed Date"] -label_pos {1480 680} \
+            -label_font Helv_10_bold -label_width 1200 -label_fill "#444444" -label_anchor w
+
+        add_de1_text $page_name 1480 900 -text [translate "Reset Counter"] -font Helv_10_bold -fill "#4e85f4" -anchor "w"
+        add_de1_button $page_name ::plugins::ro_filter_monitor::reset_counter 1480 870 1880 930 ""
+
+        # Create custom filter warning page
+        add_de1_page "water_filter_warning" "settings_message.png" "default"
+
+        # Warning message
+        add_de1_text "water_filter_warning" 1280 700 \
+            -text [translate "Time to change your water filter!"] \
+            -font Helv_20_bold -fill "#dd0000" -anchor "center" -justify "center" -width 1200
+
+        # Additional info text
+        add_de1_text "water_filter_warning" 1280 850 \
+            -text [translate "You've reached your set water usage threshold.\nReplace the filter, then reset the counter in plugin settings."] \
+            -font Helv_10 -fill "#666666" -anchor "center" -justify "center" -width 1200
+
+        # Dismiss button
+        add_de1_text "water_filter_warning" 1280 1310 \
+            -text [translate "OK"] \
+            -font Helv_10_bold -fill "#fAfBff" -anchor "center"
+
+        add_de1_button "water_filter_warning" \
+            {say [translate {OK}] $::settings(sound_button_in); page_to_show_when_off off} \
+            980 1210 1580 1410 ""
 
         return $page_name
     }
@@ -46,26 +78,94 @@ namespace eval ::plugins::${plugin_name} {
         if {[info exists settings(use_gallons)] && $settings(use_gallons)} {
             set value [expr {$settings(total_volume) / 3785.41}]
             set units "gal"
+            # Update threshold display
+            if {$settings(filter_threshold_ml) > 0} {
+                set settings(filter_threshold_display) [format "%.1f" [expr {$settings(filter_threshold_ml) / 3785.41}]]
+            }
         } else {
             set value [expr {$settings(total_volume) / 1000.0}]
             set units "L"
+            # Update threshold display
+            if {$settings(filter_threshold_ml) > 0} {
+                set settings(filter_threshold_display) [format "%.1f" [expr {$settings(filter_threshold_ml) / 1000.0}]]
+            }
         }
         set settings(filter_change_date) [string trim $settings(filter_change_date)]
-        set settings(display) [format [translate "Total water used: %.2f %s\nFilter last changed: %s"] $value $units $date_text]
+        # Split display into two columns
+        set settings(display_volume) [format [translate "Total water used:\n%.2f %s"] $value $units]
+        set settings(display_filter) [format [translate "Filter last changed:\n%s"] $date_text]
+    }
+
+    proc update_threshold {} {
+        variable settings
+        # Convert display value to milliliters based on current unit
+        if {[catch {
+            set threshold_value [string trim $settings(filter_threshold_display)]
+            set old_threshold [expr {[info exists settings(filter_threshold_ml)] ? $settings(filter_threshold_ml) : 0}]
+
+            if {$threshold_value eq "" || $threshold_value == 0} {
+                set settings(filter_threshold_ml) 0
+            } else {
+                if {$settings(use_gallons)} {
+                    set settings(filter_threshold_ml) [expr {$threshold_value * 3785.41}]
+                } else {
+                    set settings(filter_threshold_ml) [expr {$threshold_value * 1000.0}]
+                }
+            }
+
+            # If threshold changed, reset notification flag so user can be notified again
+            if {$old_threshold != $settings(filter_threshold_ml)} {
+                set settings(notification_shown) 0
+            }
+
+            save_plugin_settings ro_filter_monitor
+        }]} {
+            # Invalid input, reset to current value
+            update_display
+        }
+    }
+
+    proc check_threshold {} {
+        variable settings
+
+        # Convert the display value to ml before checking (in case user just entered it)
+        update_threshold
+
+        # Only check if threshold is set and notification hasn't been shown
+        if {$settings(filter_threshold_ml) > 0 && !$settings(notification_shown)} {
+            if {$settings(total_volume) >= $settings(filter_threshold_ml)} {
+                set settings(notification_shown) 1
+                save_plugin_settings ro_filter_monitor
+
+                # Navigate to warning page instead of popup
+                set_next_page off water_filter_warning
+                page_to_show_when_off water_filter_warning
+            }
+        }
     }
 
     proc reset_counter {} {
         variable settings
         set settings(total_volume) 0
         set settings(filter_change_date) [clock format [clock seconds] -format "%Y-%m-%d"]
-        save_plugin_settings $::plugins::de1_water_tracker_plugin::plugin_name
+        set settings(notification_shown) 0
+        save_plugin_settings ro_filter_monitor
         update_display
         popup [translate "Counter reset"]
     }
 
     proc toggle_units {} {
-        save_plugin_settings $::plugins::de1_water_tracker_plugin::plugin_name
+        variable settings
+        # When toggling units, convert the threshold stored in ml to the new unit for display
         update_display
+        save_plugin_settings ro_filter_monitor
+    }
+
+    proc save_and_close {} {
+        variable settings
+        # Save the threshold value before closing
+        update_threshold
+        page_to_show_when_off extensions
     }
 
     proc on_state_change {event_dict} {
@@ -85,8 +185,9 @@ namespace eval ::plugins::${plugin_name} {
                 Descale -
                 AirPurge {
                     set settings(total_volume) [expr {$settings(total_volume) + $::de1(volume)}]
-                    save_plugin_settings $::plugins::de1_water_tracker_plugin::plugin_name
+                    save_plugin_settings ro_filter_monitor
                     update_display
+                    check_threshold
                 }
             }
         }
@@ -95,7 +196,14 @@ namespace eval ::plugins::${plugin_name} {
     proc main {} {
         variable settings
         if {[array size settings] == 0} {
-            array set settings { total_volume 0 filter_change_date "" use_gallons 0 }
+            array set settings {
+                total_volume 0
+                filter_change_date ""
+                use_gallons 0
+                filter_threshold_ml 0
+                filter_threshold_display "0"
+                notification_shown 0
+            }
         } else {
             if {![info exists settings(filter_change_date)]} {
                 set settings(filter_change_date) ""
@@ -103,10 +211,19 @@ namespace eval ::plugins::${plugin_name} {
             if {![info exists settings(use_gallons)]} {
                 set settings(use_gallons) 0
             }
+            if {![info exists settings(filter_threshold_ml)]} {
+                set settings(filter_threshold_ml) 0
+            }
+            if {![info exists settings(filter_threshold_display)]} {
+                set settings(filter_threshold_display) "0"
+            }
+            if {![info exists settings(notification_shown)]} {
+                set settings(notification_shown) 0
+            }
         }
         update_display
-        ::de1::event::listener::on_major_state_change_add ::plugins::de1_water_tracker_plugin::on_state_change
+        ::de1::event::listener::on_major_state_change_add ::plugins::ro_filter_monitor::on_state_change
 
-        plugins gui de1_water_tracker_plugin [build_ui]
+        plugins gui ro_filter_monitor [build_ui]
     }
 }
\ No newline at end of file
diff --git a/settings.tdb b/settings.tdb
index ba64bba..302f0a2 100644
--- a/settings.tdb
+++ b/settings.tdb
@@ -1,3 +1,13 @@
-total_volume 0
-filter_change_date ""
-use_gallons 0
\ No newline at end of file
+display {Total water used: 23.86 L
+Filter last changed: 2025-10-24}
+display_filter {Filter last changed:
+2025-10-24}
+display_volume {Total water used:
+28.20 L}
+filter_change_date 2025-10-24
+filter_threshold_display 50.0
+filter_threshold_ml 50000.0
+notification_shown 0
+total_volume 28196.059855957028
+use_gallons 0
+