Links to other rainwater videos and an Amazon Parts list is below the Description.

This post cover Polyethylene Water Tank Repair – Crack. Note: Do not do any kind of welding inside a tank without proper ventilation It can kill you! We show you how to repair a crack in a Polyethylene Water Tank, but the same method can be used for anything made of polyethylene, including canoes, kayaks, or anything else.

See some of our other Rainwater Harvest videos here:
DIY Rainwater Harvesting System:    • DIY Rainwater Harvesting System  
Large Rainwater Harvesting System Design:    • Large Rainwater Harvesting System  
Rainwater Harvesting Lessons Learned:    • RainWater Harvesting Lessons Learned  
More Rainwater Harvesting System Lessons Learned:    • More Rain Water Catchment Lessons Lea...  
Rainwater Harvesting Winterization:    • Rainwater Harvesting Winterization  
Rainwater Harvesting Spring Preparation:    • Rainwater Harvesting Spring Preparation  
Large Rainwater Harvesting System Upgrade – 1200 Gallon to 4500 Gallon:    • Large Rainwater Harvesting System Upg...  
First Flush Downspout Water Diverter Product Review:    • First Flush Downspout Water Diverter ...  
Leaf Eater Product Review:    • Leaf Eater Product Review  
Rainwater Harvesting System in Action Catching rain from Tropical Storm Ida:    • Rainwater Harvesting System in Action...  
Permaculture Rainwater Harvesting Swale – How to Dig a Swale with a 2Bottom Plow:    • Permaculture Rainwater Harvesting Swa...  
Rainwater Swale 1Year Update:    • Permaculture Rainwater Harvesting Swa...  
Rainwater Harvesting System2:    • Rainwater Harvesting System2  
Video Tour of Another Completed Rainwater Harvesting Project:    • Rainwater Harvest Video Tour of Anoth...  
How to Stop Algae from Growing in you Rainwater Harvest Tank:    • How to Stop Algae From Growing in You...  
Polyethylene Water Tank Repair:    • Polyethylene Water Tank Repair – Crack  

Where to purchase: (We are an Amazon affiliate and may earn a commission on products you purchase. There is no additional cost to you!)
Poly Welder Pro 200 Watt Plastic Repair Kit (Natural): https://amzn.to/3bnRXGn
Leaf Eater Advanced Rain Head 3 in. Round: https://amzn.to/3MbgcN6
Downspout First Flush 3" https://amzn.to/3dtUkJK
Rain Harvesting First Flush WDAC02 Filter: https://amzn.to/2UioB6F
Scotts 25year pro fabric, 3 by 150feet: https://amzn.to/2UCoiSV

Valid Comment from Sp9rks: "Anyone doing this type of repair that is done inside a tank be aware of the extreme danger of confined spaces. You can die quickly and not see it coming. You may not think there's fumes etc but are risking your life. To lower the risk, have another person on the outside with something to put a large hole in the tank quickly if the worst happens and you collapse. Obviously use a fan in the tank to ventilate it but prepare for the worst. An axe etc is probably a good thing to have handy. Tanks can be replaced but not your loved one/s. Rescues from confined spaces often result in the rescuer dying as well as the other."

The Tank
I bought two 1550gallon polyethylene tanks that I found on Craig’s list. I bought both for $450, which is about half of what one tank costs. Both tanks needed a little repair, but it was still a good deal. This post covers how to repair a crack. I’ll do another post in the future on how to repair a hole or gouge.
The Crack
The crack that I’m working on looks like it happened by an object hitting the tank and creating the crack with one half of the cracked piece knocked inward.
Clean
The first step was to clean the tank. I did this with a brush, water, and mild dish soap. I washed the outside of the tank just like I would a car. This prevents dirt and debris from getting into the repaired area. On the inside, the tank had some sand in it. I took my shop vac in and vacuumed up all of the dirt on the inside and wiped down the repair area with a wet rag.
Level the Crack
The next step is to level the crack. The two pieces on either side of the crack do not line up, so I stuck a screwdriver in the crack and pried the inner piece out to line up with the outer piece.
The Welder
They make a kit for welding polyethylene. I bought my kit from Amazon and it cost just over $100. I’ll include a link to that below. The welding kit is like a big hot soldering iron with sticks of polyethylene that you use to fill in gaps.

0:00 Intro and Dent
0:56 View the Crack and Hear the Plan
2:37 The Welding Kit
4:31 Prepping the Tank
5:01 Iron to the Tank
6:24 V in the Tank
7:10 Fill the V
7:53 Inside the Tank (Use Ventilation)
8:44 Screen Going In
10:08 Screen Installed
11:27 Conclusion

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