Pool Chemicals You Need vs Don't | Pool Pro't)

Walk into any pool store and you'll see 50+ different chemicals on the shelves. Clarifiers, enhancers, stabilizers, algaecides, enzymes, phosphate removers, metal sequestrants, stain fighters... it's overwhelming. And that's the point — the pool chemical industry makes billions selling products most pool owners don't need. Here's the honest breakdown from CPO certified technicians who maintain pools every day.

The Essentials: Chemicals You Actually Need

These are the only chemicals you need to maintain a healthy pool. Everything else is optional or unnecessary for most situations.

1. Chlorine (Sanitizer)

The single most important chemical in your pool. Kills bacteria, viruses, and algae. You need it — period. No exceptions.

Best forms:

• Liquid chlorine (sodium hypochlorite, 10-12.5%) — Our #1 recommendation. Adds only chlorine and a small amount of salt. No CYA, no calcium buildup. Buy at hardware stores or pool supply. $3-5 per jug.
• Trichlor tabs (3" pucks) — Convenient for constant low-level chlorination via floater or inline feeder. Adds CYA with each tab — monitor levels.
• Dichlor shock — Good for occasional shocking. Adds CYA, so don't use as your primary chlorine source.

Our recommendation: Use liquid chlorine for daily/weekly dosing and a trichlor tab in a floater for convenience. Monitor CYA and switch to liquid-only when CYA hits 50.

2. Muriatic Acid (pH Down)

Lowers pH and Total Alkalinity. In Texas, your pH will drift up constantly (especially with a salt system). Muriatic acid is cheap, effective, and essential. Get it at any hardware store for $8-12 per gallon.

Safety: Always add acid to water, never water to acid. Wear gloves and eye protection. Store in a well-ventilated area away from chlorine.

3. Sodium Bicarbonate (Alkalinity Increaser / Baking Soda)

Raises Total Alkalinity without significantly affecting pH. This is literally baking soda — you can buy it at the grocery store for $1-2 per pound vs $15+ at the pool store labeled "Alkalinity Increaser."

Dosage: 1.5 lbs per 10,000 gallons raises TA by 10 ppm.

4. Cyanuric Acid (Stabilizer / Conditioner)

Protects chlorine from UV destruction. In Texas, CYA is essential — without it, the sun destroys your chlorine in hours. Add it once at the beginning of the season and top off as needed. It doesn't evaporate, so it only goes down through splash-out and backwashing.

Target: 30-50 ppm. Above 60 ppm and you need more chlorine to be effective. Above 80 ppm and you should drain some water.

5. Calcium Chloride (Hardness Increaser)

Raises Calcium Hardness. Needed for plaster pools to prevent the water from leaching calcium out of the plaster surface (which causes etching and damage). Vinyl and fiberglass pools can run lower CH.

Target: 200-400 ppm for plaster, 150-250 ppm for vinyl/fiberglass.

Nice to Have: Conditionally Useful

These chemicals have legitimate uses but aren't needed by every pool owner.

6. Borate (ProTeam Up, Borax)

Borates buffer pH and can reduce how much acid you need. Also makes the water feel smoother and can reduce chlorine demand. Useful if you're constantly fighting pH rise (especially saltwater pools). Not essential, but helpful. Cost: $30-50 for a season's supply.

7. Metal Sequestrant

If you have iron or copper in your fill water, metal sequestrant prevents staining and discolored water. In some DFW areas (particularly well water), this is essential. Test your fill water to know if you need it.

8. Polyquat Algaecide (60%)

The only algaecide we recommend. It's a preventative, not a cure — use it when you're going on vacation or when you know chlorine might drop. Don't use quat algaecides (they foam) or copper algaecides (they stain). Get the 60% polyquat formulation.

Skip These: Unnecessary Pool Chemicals

These products sell well at pool stores because they sound useful, but for most pools they're a waste of money.

🚫 Phosphate Remover

Phosphates are food for algae — but if your chlorine levels are correct, algae can't grow regardless of phosphates. Phosphate remover costs $30-60 per treatment and needs to be reapplied constantly. Maintain proper chlorine and you don't need it. The only exception: if you're in an area with extreme phosphate levels in the fill water (above 1,000 ppb) and you can't keep up with chlorine demand.

🚫 Enzyme Treatments

Enzymes break down oils and organics, which can help with scum lines and filter clogging. But proper chlorine levels already oxidize organics. Enzyme treatments are $20-40 per month for a solution to a problem you shouldn't have if your chemistry is right.

🚫 Clarifiers

Clarifiers clump small particles together so the filter can catch them. They're a band-aid, not a fix. If your water is cloudy, there's a chemistry or filtration problem that clarifier won't solve. Fix the root cause (usually low chlorine, poor filtration, or high calcium) and the water clears on its own.

🚫 Flocculant (Drop-Out)

Flocculant sinks particles to the bottom so you can vacuum them to waste. It works, but it wastes water and only fixes the symptom. If you need flocculant more than once, you have an underlying chemistry problem. Fix that instead.

🚫 "All-in-One" Chemicals

Products like "Pool Perfect" or "Nature2" that claim to reduce chlorine demand, clarify water, and condition the pool all in one. They're expensive and unnecessary. Proper chlorine, pH, and alkalinity management does all of this for a fraction of the cost.

🚫 Copper Algaecide

Copper kills algae, but it also stains plaster and turns hair green. The staining is permanent. Use polyquat instead — it's effective without the side effects.

Your Complete Pool Chemical Shopping List

That's it. Five essential chemicals, three conditional ones, and six products to skip. Total cost for a season of essential chemicals: about $200-300. Compare that to the $500-1,000+ some pool owners spend on the 20+ products the pool store recommends.

Or skip the chemistry class entirely — our weekly service includes all chemicals for $180/month. CPO certified technicians test, balance, and maintain your pool so you don't have to think about any of this. Call 682-399-2593 or get a free quote online.