Add shower drain cleaning guide with step photos

Document how to remove, clean, and replace the shower drain filter,
with the five step photos moved into content/infrastructure/images/.
Note that some shower drains differ and to ask management for help (and
to flag undocumented designs). Link from the water page and the
infrastructure index.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

content/infrastructure/index.md

@@ -16,6 +16,7 @@ Documentation for the property's core systems and utilities.
 
 - [[electrical|Electrical & Circuit Breakers]]
 - [[water|Water System]]
+- [[shower-drain-cleaning|Cleaning a Shower Drain]]
 - [[heating-system|Heating System Overview]]
 - [[internet|Internet & Communications]]
 

content/infrastructure/shower-drain-cleaning.md

@@ -0,0 +1,73 @@
+---
+title: Cleaning a Shower Drain
+description: How to remove, clean, and replace the shower drain filter to keep water draining freely
+aliases:
+  - shower drain
+  - drain cleaning
+  - slow drain
+  - clogged shower
+tags:
+  - infrastructure
+  - water
+  - cleaning
+  - maintenance
+---
+
+# Cleaning a Shower Drain
+
+If your shower is draining slowly or standing water builds up around your feet, the drain filter is probably clogged with hair and soap residue. Cleaning it takes a few minutes and no special skills.
+
+> [!tip] Do this regularly
+> Hair and soap scum build up over time. Cleaning the filter every few weeks (or whenever you notice the water draining slowly) prevents bigger clogs and keeps the pipes clear.
+
+## What you'll need
+
+- A flat tool to lift the cover — a flathead screwdriver, butter knife, or similar
+- A pair of pliers (needle-nose work best) to grip the filter
+- An old toothbrush or rag, and a bin for the gunk you pull out
+
+> [!note] Different drains, different parts
+> The drain shown here has a **metal cover plate** over a **removable plastic filter cartridge**. Some showers on the property have a different drain design (a simple grate, a screw-in cover, a bottle-trap, etc.).
+>
+> **If your shower drain doesn't look like the one in these photos and isn't documented here yet, ask management for help** rather than forcing anything — and let us know so we can add it to this guide.
+
+---
+
+## Step 1 — Remove the cover
+
+Slide your flat tool under the edge of the metal cover plate and gently pry it up. It just sits in place — it isn't screwed down — so it should pop out with light leverage.
+
+![[shower-drain-1-remove-cover.jpg]]
+
+## Step 2 — Lift out the filter
+
+Underneath the cover is a white plastic filter cartridge seated in the drain collar. Grip the small post (or the edge) in the centre with your pliers and pull straight up to lift the whole cartridge out.
+
+![[shower-drain-2a-remove-filter.jpg]]
+
+![[shower-drain-2b-remove-filter.jpg]]
+
+## Step 3 — Clean the filter
+
+This is where the clog lives. Pull off the trapped hair and soap buildup, then rinse the cartridge thoroughly under a tap and scrub it with the toothbrush until the openings are clear. Put the gunk in the bin — **don't push it back down the drain.**
+
+![[shower-drain-3-clean-filter.jpg]]
+
+## Step 4 — Replace the filter (mind the orientation)
+
+Drop the clean cartridge back into the drain.
+
+> [!important] Orientation matters
+> The cartridge has a rubber seal (O-ring) near the top and an angled / shaped end — it only seats correctly one way round. Line it up and press it in until it sits flush, then put the metal cover plate back on top. If it won't seat flat, lift it out and turn it before pushing again — don't force it.
+
+![[shower-drain-4-replace-orientation.jpg]]
+
+Run the water for a few seconds to confirm it drains freely. Done.
+
+---
+
+## Still draining slowly?
+
+If the drain is still slow after cleaning the filter, the clog is further down the pipe. **Don't pour harsh chemical drain cleaners down it** — see the [[water#Septic-Safe Practices|septic-safe practices]] note. Ask management for help instead.
+
+See also: [[water|Water System]]

content/infrastructure/water.md

@@ -70,6 +70,10 @@ tags:
 - Space out laundry loads
 - No harsh chemicals
 
+## Drains
+
+- Shower draining slowly? See [[shower-drain-cleaning|Cleaning a Shower Drain]].
+
 ## Winter Precautions
 
 - Know which pipes are vulnerable to freezing