Chemical Log

Click on Pool Calculators to find how much of which chemicals to add.

Use our Chemical / Cleaning Log for a Daily Maintenance Log in a downloadable .pdf file.

Shock - Chlorine powder

Use calcium hypo chlorite to “shock” the pool once a week or after heavy use or heavy rain. Use 1 lb. per 10,000 gallons per 1 ppm of combined (waste) chlorine. Combined chlorine is chlorine that is attached to a waste product. It has done its job and can no longer kill germs effectively. Shocking burns up waste products that build up as the chlorine from your tablet feeder kills germs. Swimmers can return when free chlorine level is 3 ppm or below (but not lower than 1 ppm). Confusing? Use a DPD test kit and use the "pool calculations" feature above or, better yet, bring us a water sample and we'll help you.

We sell and use only 65% cal hypo chlorine shock. Beware of shock with lower concentrations!

Oxy-Shock (Non-chlorine)

Use Oxy-Shock to burn up waste products if your free chlorine level is 3 ppm or above. Oxy-shock is great if heavy bather loads is clouding the water because of increased oils, sweat, etc. Do not use oxy-shock if the free chlorine level is below 3 ppm. Do not use oxy-shock to get rid of combined chlorine. You’ll need a chlorine shock to do that.


On most pools, the best way to keep a correct chlorine level in your water is to use tablets in a feeder (chlorinator). TriChlor tablets include chlorine and stabilizer (keeps UV light from causing chlorine to leave the water). Use 3” tablets for normal use and 1” tablets for heavy use. We sell tabs with 90% available chlorine. Beware of cheaper tabs with less concentration.

Bromine is the best sanitizer for spas.

Balancing chemicals

Water is “balanced” when it is not corrosive (low pH or acidic) or scale forming (high pH or alkaline). To keep water balanced, control the pH, alkalinity and calcium hardness.

Alkalinity Increaser (sodium bicarbonate)
Add sodium bicarbonate to increase TA (Total Alkalinity). If alkalinity is too high, call us for instructions on how to add acid properly to reduce alkalinity.

pH Decreaser (Muriatic Acid or Dry Acid)
Acid lowers both pH and alkalinity. Use an acid demand test for proper dosage. Use eye protection and add all around your pool or spa and away from the plaster.

pH Increaser (Soda Ash or sodium carbonate)
If your alkalinity is correct, but your pH is is low, add soda ash.

Calcium Increaser (Calcium Chloride)
After adding fresh water, especially in a spa, you may need to add calcium hardness increaser, so the water is not too soft. Soft water is aggressive and causes damage to your plaster and equipment.

All about algae

Algae is brought into the pool by wind, rain, contaminated cleaning equipment and animals.

Green Algae is the most common algae. It is usually controlled by chlorine, but resistant forms are common.

Yellow algae is chlorine resistant. It often blooms all around the pool on the walls. Mustard algae is another common name for this pest.

Black algae is actually a blue-green algae which appears as black dots on your plaster. It puts down “roots” into the plaster and protects itself from chlorine by forming a waxy coating on its surface.

Many algae problems - One Solution: Sea Klear Algae Prevention and Remover

Also Needed....

Clarifiers clump tiny particles that make removing them with your filter more effective.

Metal Out
For pools, prevents metal staining and helps clear discolored water caused by high metal or mineral content, especially in salt water pools.

Phosphate Remover
We can test for phosphates. When they are high, you’ll want to remove them to help prevent algae blooms.

Enzymes are an effective way to eliminate oils, lotions and organic materials in pool water, reducing the maintenance required for filters or the need use chlorine shocks or oxy-shocks.

Rainbow 320 rebuild kit
If your feeder needs help, but replacing it will be difficult, this rebuild kit will save the day.

Rainbow feeders

We carry a complete line of chemical feeders for any size pool or spa.


300 rebuld kit

Rainbow 320 rebuild kit.
If your feeder needs help, but replacing it will be difficult, this rebuild kit will save the day.


300 rebuild

Rainbow 300-29 rebuild kit.


cat controller

The CAT 2000

The CAT 2000 automated controller is the water quality solution for pools, spas, waterparks and a multitude of other water treatment applications world-wide. The powerful microprocessor-based design makes simple science of water chemistry maintenance under even the most challenging conditions. Constantly monitoring pH and sanitizer activity, the CAT 2000 implements chemical dosing in proportion to demand. This proportional feed capability ensures precise water conditioning without overfeeding. For more information visit CAT's web site: