Pentair | 521378 | 4-Gallon Muriatic Acid Tank – For Automated Chemical Feed Systems

Frequently asked questions

How do I use this safely?

Follow the dosing instructions on the manufacturer's label rather than a general rule of thumb, add chemicals to water and never water to chemicals, and never mix pool chemicals together. Store containers sealed, dry and away from each other.

What is the part number for this product?

Pentair lists this product under part number 521378. Quote 521378 when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.

How often should I test my pool water?

Test free chlorine and pH at least weekly during the season, and total alkalinity, calcium hardness and cyanuric acid monthly. Balanced water protects the equipment as much as the swimmers - low pH corrodes heat exchangers, high hardness scales them.

How do I confirm this fits my equipment?

Match the part number stamped on the component you are replacing, or look it up in the parts list for your Pentair equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.

Do these products expire?

Yes. Test reagents and strips degrade with age, heat and light, and chlorine products lose strength in storage. Buy quantities you will use within a season and keep them somewhere cool and dark.

Is there a warranty on this product?

It carries the standard Pentair manufacturer warranty. The terms are set by Pentair, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.