Changes

Natural or artificial ground catchment and Lined sub-surface tanks

No change in size, 15:19, 6 April 2012

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#Cost: Polyethylene and Polythylene liners typically cost half that of Polypropylene and EPDM. PVC and PVC-E liners are the next step up from Polyethylene and polyethylene in terms of cost. Compared to other liners, PVC is somewhat more affordable, while being somewhat puncture resistant at the same time but in terms of durability, the typical 20-mil (i.e. 0.020") thick PVC is somewhat mediocre in terms of durability. EPDM is more expensive than Polyethylene, polyethylene, and PVC liners, but can last for up to 20 years. Polypropylene is an expensive material but can last for up to 40 years.<br>

#Durability:

**##Polyethylene and Polythylene liners typically only last one season.

##Polyethylene will readily conform to any shape, however, it does not have the sturdiness that is required for a permanent pond liner.

##Polythylene, on the other hand, is extremely rigid and can be stiff to work with. Polythylene can be damaged easily by rocks, and has to be handled with care. If polyethylene is damaged, it cannot be seamed together without expensive welding equipment.

Winona

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