Firestone W56PL452020 EPDM Rubber Pre Cut and Boxed Pond Liner, Midnight Blue, 20-Foot length x 20-Foot Width x 0.045-Inch Thick

I used it to waterproof a second story deck floor for a utility space under it. Excellent product. Heavy duty, strong, and durable. Worth the price.

So glad I made the right choice to upgrade / purchase something that is worth the price. This is a REAL POND LINER. The fact that I / we, can purchase an item such as this via Amazon is awesome. I went to many different sites, and local locations, etc. and either out of stock, had to be ordered and take weeks to arrive, or you can see they were upselling the item. This liner is working great, fit perfect and no leaks so far. durable, reliable and worth every penny. You are improving upon your home, business, community, etc. and thus make it a purchase worth lasting a long time.

This liner came in a well packaged cardboard box, folder many times, but realize the 20x20 size is super heavy. It took four people to properly move it into place. If you have a very irregularly shaped pond, like I did, you will need to spend some time trying to get the folds to look reasonable, which is harder than one might expect. Part of this is due to the thickness of the material. I recommend you only start laying this during the cooler parts of the day, as it gets super hot in the sun.

I like the quality of the liner. Just put them on my pond .

Appears to be very durable - heavy weight. Remember, you get what you pay for. Last liner was cheap, much thinner, made of vinyl, only lasted 8 year. Had become very brittle, developed holes, and leaked. This product is supposed to last 20 years. I think it will. Time will tell. So far it works well. I love it.

Con: super heavy, get help if available. Almost broke my back carrying it to the backyard. Pros: it looks and feels like something that will last forever. Perfect for a long-term pond project. It's not the cheapest you can get but you get what you pay for.

3rd order - first two were perfect...8 years running. Each time before I received a single large 20x20 pc....This time I purchased from BestNest Inc and received an EPDM that was pieced together to make the total...absolutely NOT acceptable. If I wanted it pieced together I would have bought small parcels and done it myself. This was not advertised by BestNest Inc and I would AVOID buying this from BestNest Inc since you will get a segmented unit that has been glued/pieced together. I'm submitting a return form and will follow-up with false advertising complaint with Amazon. Assuming you get a single segment of 20x20 this is fantastic and holds up well. I've used it with my koi for 8 yrs running but WITHOUT a seam. If you pay full price for a 20x20 ft then you should get a 20x20 ft WITHOUT seams. Seams were NOT disclosed - avoid BestNest Inc as the vendor. Prior Reviews... This is our second order in two months...the first was a 15x20 foot product and then this 20x20 foot product. The prices were far below what we could get locally for exactly the same item, manufacturer etc...with the added benefit of delivery direct to the door in just a few days. After doing a lot of research both online and with local pond experts, we decided to go with the EPDM rubber pond liner despite the additional cost. Not only is it considered more environmentally sound and durable, but almost a necessity if you want fish without fear of contamination etc... Since a pond is not something we want to re-do every few years due to a poor quality liner, nor do we want to risk puncture/tears/rips that could ruin the plants and fish, this seemed like the best option and most cost effective in terms of time and expensve over the long run. BUT, when we began searching locally for an EPDM liner, the price was either very high OR the size options very small. Originally we thought about a 10x15 size but after calculating pond dimensions and depth (don't forget the depth), realized it was not sufficient. (As a side note, for those that are searching for a basic pond rule of thumb...take the desired length of feet, add 2 feet, and 2x desired depth to calculate width. Do the same for width). Decided to order this - very pleased with the purchase. The price per square foot was competitive with the best local prices per square foot for the smaller sizes yet we were able to get a larger dimension for a more useful pond size. Thickness is of a very nice quality. Seller was prompt, delivery quite rapid. This was the same liner a professional pond installer uses on his personal pond so should last for a substantial period of time. Overall, great product and a great price with superb service!

Delivered earlier than expected, a little heavy to handle alone (20x20)