Chapter 9 Key Takeaways: Toilets, Sinks, and Fixtures

The Toilet Tank

A toilet has three main internal components: the fill valve (refills the tank), the flapper (seals the tank bottom between flushes), and the overflow tube (safety backup that prevents tank overflow).
A running toilet is almost always caused by one of two things: a leaking flapper or a fill valve that isn't shutting off. Both are $5–$15 parts and easy DIY repairs.
The food-coloring test (add dye to the tank, don't flush, see if color appears in the bowl after 15 minutes) is the definitive flapper leak test. It costs nothing and takes 15 minutes.
A running toilet wastes 20–50 gallons per hour and can add $30–$200 to a monthly water bill. This is a repair to make immediately, not eventually.
Phantom flushing (toilet refills by itself) is just a slow flapper leak — same diagnosis, same fix.

There are four faucet valve types: compression (multi-rotation handle, oldest), ball (single handle with hemispherical motion), cartridge (single or double handle, most common modern design), and ceramic disc (single handle with short lever motion, most durable).
Identifying the faucet type before beginning a repair is essential — the parts and procedure differ completely.
Cartridge replacement is the most common DIY faucet repair. The cartridge must match the specific faucet model; generic replacements often don't seal correctly.
Always shut off the supply valves under the sink before opening any faucet for repair.

Bathroom sink stoppers operate via a pivot rod and clevis strap linkage. The most common adjustment (stopper won't stay up or down) requires moving the pivot rod to a different hole in the strap — no parts, no tools, two minutes.
Hair and soap scum in the drain around the pivot rod and stopper is the number-one cause of slow bathroom sink drains. It costs nothing to remove.
Garbage disposals are for food scraps, not garbage. Avoid fibrous foods, grease, starchy foods in quantity, hard items, and "flushable" wipes.
A disposal that won't spin but hums: use the hex wrench on the bottom to free the jammed impeller plate. Press the reset button. Try again.
Never reach into an installed disposal.

WaterSense certification (EPA program) is meaningful — 1.28 GPF or less, plus independent flush performance testing.
MaP scores measure actual flush performance on a quantitative scale. Use them to compare toilets. Publiclyavailable at maptest.org.
PVD (Physical Vapor Deposition) faucet finishes are genuinely more durable than standard plating — a real material science difference worth paying for in high-use fixtures.
Lever handles are better than knobs for everyone: universal design that works for wet hands, limited mobility, and children alike.
Federal maximum: toilets 1.6 GPF, faucets 2.2 GPM, showerheads 2.5 GPM. WaterSense thresholds are lower.
Aerators that reduce flow to 1.0 GPM in bathroom faucets cost $3–$6, take 5 minutes to install, and cut bathroom water use significantly with no noticeable impact on daily use.

DIY: flapper replacement, fill valve replacement, cartridge replacement, drain stopper adjustment, aerator replacement, showerhead replacement — all with basic tools and skill.
Call a plumber: when supply valves are corroded and won't turn, when the valve body itself is damaged, when a wall-mount or in-wall fixture needs work, when any fixture replacement requires moving supply or drain lines.

A running toilet: $7–$15 repair vs. $30–$200/month in water waste. Fix it today.
A dripping faucet at 1 drip/second: 3,000 gallons/year wasted. A $20 cartridge fixes it.
Replacing a pre-1994 toilet (3.5–7 GPF) with a WaterSense HET (1.28 GPF) in a 4-person household: ~16,000 gallons/year saved, ~$160/year. Payback on a $250 toilet: under two years.
Fixture selection: spend more on kitchen faucets, shower valves, and tub controls (hard to replace later). Spend conservatively on bathroom lavatory faucets and standard toilets.