Chapter 9 Exercises: Toilets, Sinks, and Fixtures

These exercises are designed to be done in your own home. You'll need basic tools and a willingness to open up fixtures you use every day. Most exercises require no special skills and cost nothing.

Exercise 9.1 — Toilet Tank Anatomy Tour

Time required: 15–20 minutes Materials: Flashlight, notepad

Remove the lid from your toilet tank and set it safely aside. Identify each component described in Section 9.1:

  1. Locate and name the fill valve. Is it a ballcock (large float on a horizontal arm) or a modern float-cup design?
  2. Find the flapper. What color is it? Does it look flexible or has the rubber hardened and cracked?
  3. Identify the overflow tube. Hold a ruler or tape measure next to it — note the height of the overflow tube relative to the water level.
  4. Find the chain connecting the handle arm to the flapper. Is there about a half-inch of slack, or is it too loose or too tight?
  5. Measure (or estimate) the water level. Is it approximately 1 inch below the top of the overflow tube?
  6. Sketch a simple diagram of what you see and label each part.

Reflection questions: Does anything look worn, discolored, or degraded? Is the water level correct? Is the chain adjusted properly?

Exercise 9.2 — The Flapper Leak Test

Time required: 20 minutes (including wait time) Materials: Food coloring (any color)

This exercise checks whether your toilet flapper is sealing properly — one of the most common and most overlooked sources of water waste.

  1. Add 6–10 drops of food coloring to the toilet tank. Do not flush.
  2. Set a timer for 15 minutes. Use the bathroom for other tasks. Do not flush.
  3. After 15 minutes, look at the toilet bowl without flushing. Is there any color in the bowl water?
  4. If yes: the flapper is leaking. Note the color of the tank water vs. the faint color in the bowl.
  5. Flush to clear, then repeat the test with the refill tube temporarily disconnected from the overflow tube (to confirm the color is migrating through the flapper, not down the overflow).

If your flapper is leaking: Price a replacement flapper at your local hardware store. Note the toilet manufacturer (stamped inside the tank or on the bowl rim) and find the appropriate flapper. Calculate how much the repair costs vs. the ongoing water waste.

Exercise 9.3 — Faucet Type Identification Tour

Time required: 20 minutes Materials: Notepad or phone for notes

Walk through every faucet in your home and identify the valve type for each, using the identification guide from Section 9.3.

For each faucet, record: - Location (kitchen, bathroom 1, bathroom 2, laundry, etc.) - Single or double handle - Handle motion: multi-rotation? Ball-socket sweep? Short up-down lever? Rotates less than 180 degrees? - Likely valve type: Compression / Ball / Cartridge / Ceramic disc / Unknown - Any current problems (dripping, stiff handle, inconsistent temperature)?

Goal: By the end, you should have a fixture inventory that tells you what type of repair each faucet requires if it begins to drip.

Exercise 9.4 — Replace a Faucet Aerator

Time required: 10–15 minutes Materials: Needle-nose pliers or channel-lock pliers with tape (to protect finish), white vinegar, toothbrush

The aerator is the small screwtop tip at the end of every faucet spout. It's one of the most maintenance-neglected parts of a faucet.

  1. Select a bathroom faucet. Unscrew the aerator counterclockwise — hand-tight usually; use pliers with tape if stuck.
  2. Disassemble the aerator: note the stack — usually a screen, a flow restrictor disc, a rubber washer, and the housing.
  3. Inspect the screen for mineral scale or debris.
  4. Soak all components in white vinegar for 10 minutes. Use a toothbrush to scrub deposits.
  5. Rinse, reassemble in the same order, reinstall.
  6. Turn on the faucet. Does the flow seem stronger or more even than before?
  7. Check the GPM rating stamped on the aerator (or the packaging if you bought a replacement). Is it 2.2 GPM, 1.5 GPM, or lower?

Extension: For any aerator with a rating above 1.5 GPM, price a 1.0 GPM WaterSense aerator as a potential upgrade ($3–$6). Calculate the annual water savings if you made the swap.

Exercise 9.5 — Under-Sink Inspection

Time required: 20 minutes Materials: Flashlight, dry paper towel or tissue

Open every under-sink cabinet in your home and conduct a systematic inspection.

For each sink, check: 1. Supply lines: are they flexible braided-steel, older chrome/plastic, or copper? Any signs of corrosion, swelling, or crimping? 2. Shut-off valves (angle stops): can you turn them by hand? Exercise them by turning clockwise until they stop, then counterclockwise to reopen fully. Note any that are stiff, corroded, or won't turn. 3. P-trap and drain connection: any signs of moisture, calcium deposits, or active dripping? 4. Touch the drain pipe below the trap — is there any moisture or weeping? 5. Feel the bottom of the cabinet — soft wood = previous moisture problem.

Document any issues found. A stuck or non-functioning shutoff valve needs attention before it's needed in an emergency.

Exercise 9.6 — Drain Stopper Adjustment

Time required: 15–20 minutes Materials: None, possibly small pliers

Choose a bathroom sink. Operate the lift rod (the small knob behind the faucet). Does the stopper rise and fall fully and seal properly?

  1. Open the drain fully by lifting the rod. Does the stopper come up completely or partially?
  2. Close the drain. Fill the basin with 2 inches of water. Does it hold without draining?
  3. If the stopper isn't working optimally: under the sink, find the horizontal pivot rod entering the drainpipe. Squeeze the spring clip and slide the rod from the clevis strap. Move it to a higher or lower hole in the strap. Reinstall. Test again.
  4. Operate the stopper 10 times. Does it move smoothly?
  5. Remove the stopper (rotate counterclockwise) and examine the rubber seal. Is it cracked or hardened?

Reflection: Did you need to adjust the linkage? This type of adjustment is the most common drain stopper repair and requires no parts and no tools.

Exercise 9.7 — Garbage Disposal Safety and Reset Test

Time required: 15 minutes Materials: Flashlight, Allen/hex wrench (usually 1/4-inch)

  1. Turn off the disposal switch and confirm the disposal is not running.
  2. Shine a flashlight into the disposal from above. Never put your hand inside an installed disposal.
  3. Locate the hex socket on the bottom of the disposal (reach under the sink). Insert a hex wrench and rotate it back and forth. Does it turn freely or with resistance? Free rotation means the impeller plate is unobstructed.
  4. Locate the red reset button on the bottom of the disposal. Is it popped out (indicating a previous trip) or flush? Press it in firmly until it clicks.
  5. With cold water running, turn on the disposal for 10 seconds. Listen for normal operation vs. hum-without-spinning.
  6. Drop 6 ice cubes into the running disposal with cold water flowing. Listen to the grinding sound change as the ice scours the grinding ring.

Note: If the disposal hums but doesn't spin, the procedure is: turn off the switch, use the hex wrench to manually rotate the plate, press the reset button, then try again.

Exercise 9.8 — Fixture Efficiency Audit

Time required: 30–45 minutes Materials: 1-gallon bucket, stopwatch or phone, notepad

Conduct a water efficiency audit of your home's fixtures.

Faucet flow test: 1. Place a 1-gallon bucket under a bathroom faucet at full open. 2. Time how long it takes to fill. 3. Calculate GPM: 60 / seconds to fill = GPM. (30 seconds = 2.0 GPM; 40 seconds = 1.5 GPM; 60 seconds = 1.0 GPM) 4. Repeat for the kitchen faucet and any other faucets. 5. Record results.

Toilet flush volume estimation: 1. Check the toilet tank for a GPF marking (usually stamped or labeled inside the tank or on the toilet itself). 2. If not labeled: estimate by era. Pre-1980 = likely 5–7 GPF. 1980–1994 = likely 3.5 GPF. Post-1994 = 1.6 GPF or less. 3. Look for the WaterSense label if the toilet is newer.

Showerhead flow test: 1. Place a bucket under the showerhead. Run for exactly 15 seconds at the temperature you'd normally use. 2. Measure water collected. Multiply by 4 for GPM. 3. Current federal maximum: 2.5 GPM. WaterSense: 2.0 GPM or less.

Calculate household use: Estimate how much you could save annually by upgrading the highest-flow fixture you found. Use the math from Section 9.7.

Exercise 9.9 — Toilet Running Toilet Diagnosis and Repair

Time required: 30–60 minutes (including any repair) Materials: Replacement flapper (optional, ~$7), possibly replacement fill valve ($12–$15)

This exercise builds on Exercise 9.2 and walks through a full diagnosis.

  1. Confirm whether the toilet is running by listening for continuous water sound from the tank or bowl.
  2. If running: determine which of the two root causes is present. Do the food-coloring test (flapper leak) AND observe whether the tank water level is at or above the overflow tube (fill valve not shutting off).
  3. If flapper is leaking: shut off the supply valve, flush to empty the tank. Unhook the flapper chain from the handle arm. Remove the flapper from the overflow tube ears (it pulls straight off or unsnaps). Take the old flapper to the hardware store or photograph the toilet model. Purchase the correct flapper. Reinstall, reconnect chain with proper slack, turn supply back on, test.
  4. If fill valve is not shutting off: try adjusting the float first. If adjustment doesn't work, replace the fill valve (Fluidmaster 400A or similar universal valve). Shut off supply, flush to empty, disconnect supply line, unscrew the fill valve locknut under the tank, remove old valve, install new one per instructions.
  5. After repair: check for any leaks at all connections. Test 10 flushes over the next hour.

Exercise 9.10 — Evaluate a Fixture for Replacement or Upgrade

Time required: 30–45 minutes Materials: Phone for research

Choose one fixture in your home that is either showing its age, failing, or simply inefficient.

  1. Research the current cost of a comparable replacement fixture.
  2. Determine whether replacement is DIY-feasible (same size, accessible connections) or would require a plumber.
  3. Calculate the total cost of DIY replacement (fixture + any parts) vs. professional installation.
  4. If water efficiency is the motivation: calculate the payback period using the formula: (Fixture cost) / (Annual water savings in $).
  5. Identify any WaterSense-certified alternatives for the fixture you're replacing.
  6. Make a recommendation to yourself: replace now, replace when it fails, or leave it as-is.

Write up a one-paragraph justification for your recommendation.