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JR® Once Through Evaporative Cooler Cleaner

in stock, ready to be shipped
Original price $6.49 - Original price $6.49
Original price
$6.49 - $6.49
Current price $6.49
Easy, one-step cleaner for evaporative coolers and water lines that have salt, calcium, rust or other mineral buildup. Similar to JR’s ECT, with higher amounts of organic and inorganic acids to remove buildup quickly. JR’s will protect the metal surfaces of the cooler to prepare the cooler and pads for better, more efficient performance. For increased performance/maintenance, add JR’s ECT when refilling reservoir to create a cooler environment with cleaner air and to conserve water usage. This product contains organically-inhibited acids. Use 32 oz max in a full reservoir of fresh water.
  • Bio-degradable
  • Non-hazardous
  • ECT cleans and prevents: rust, scale, corrosion and bacteria odor
  • Pad replacement
  • Conserves water: one quart of concentrate is used per 25 gallons of water in reservoir
  • Two treatments per cooling season is recommended


If your cooler is equipped with a bleed-off, disconnect it. Remove all loose material from pads and reservoir. Rinse out the pan area. Fill reservoir with clean water and add contents of JR's ONCE THROUGH bottle.

Remove blower drive-belt, replace pad panels and circulate water for 6 to 12 hours. If build up is excessive, additional treatments of JR's ONCE THROUGH CLEANER may be required. When cleaning is finished, attach hose to drain and flush reservoir. Do not allow water flushed out of reservoir to settle on roof, side walks, driveways or plants. Then simply reinstall drive-belt, and refill reservoir with clean fresh water. For better cooler performance and proper maintenance add JR's EVAPORATIVE COOLER TREATMENT when refilling reservoir. It will cause your home to become cooler, and your air much cleaner, as well as save you on the use of water.

All orders take about 2-24 business hours to process and ship out. All packages will ship Monday-Friday.

Your order will be packaged with care and discretion. Items are securely wrapped to prevent shifting while in transit.

When your order is shipped, you will receive an email notification which includes a tracking number. You can also track your order through your profile page here.

Orders Over A Certain Weight Are Subject To Pallet Deliveries Which Could Be Subject To Higher Shipping Costs, However Shipping Speeds Remain The Same 1-4 Days, Depending On Location.

Please note: Tracking numbers often take up to 24 hours to be recognized by carriers. If you attempt to track your order and the tracking number returns a non-trackable message, please try again later as your tracking number may not have yet been fully recognized by your carrier. 

-We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

-Please note: After 30-Days a Restocking Fee will be applied to all returns after 30-Days.
-To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
-To start a return, you can contact us at or come in-store. 
- Items sent back to us without first requesting a return will not be accepted.

-Unfortunately, WE CANNOT accept returns on Clearance, Sales Items & Gift Cards

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items
Certain types of items cannot be returned, like perishable goods (such as food, flowers, or plants). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.

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