Question 1

After six moths the air flow slowed down, so decide to open it and found out one of the diaphragm was torn can I buy repair kit to replace it?

Accepted Answer

Here is the diaphragm for it, looking at the images this is the 958 model so that's the one I linked
https://www.amazon.com/hygger-Pump-Diaphragm-Accessories-HG-958/dp/B0BTCZKT5D?ref_=ast_sto_dp

Question 2

Would this be suitable to use to provide air to multiple sponge filter in multiple tanks? Say 2 or 3 40gal Breeders? Thank you!

Accepted Answer

I would Probably get the 10w. I have both 5w and 10w it a big step up in GPH and noticeable to. 5w puts out a lot of power with no noise. Depending on your filtration needs I’d say the 5w might be good for 2 tanks and the 10w for 3 40 breeders.

Question 3

When the air volume is turned down, does this pump use the same amount of energy or is the energy consumption noticeably reduced?

Accepted Answer

the energy consumption will reduce.

Question 4

Is this pump good for a 20 gallon fish tank? And when turning the air flow down real low will this action effect the longevity of the pump? Thank you.

Accepted Answer

Hello, it can be used, and this action will not affect the life of the pump.
There are four conditions that will be affected. 
One is the use of ambient has many impurities, which can easily be sucked into the pump, causing the inside of the pump to be blocked, but you only need to pay attention to disassembly and cleaning. And if it is used indoors, it will take a long time to clean. When the pump's air volume becomes weaker, and it is not caused by adjustment, it needs to be cleaned. Thank you. 
The second is that the 5W model should not be connected to more than two devices, and 10W is more than three. Don't over-support the device to ensure the life of the air pump. Thank you.
The third one is a 10W pump for air stone or filter etc cannot exceed 6 feet water depth; 5W cannot exceed 5 feet water depth.
The fourth is to pay attention to the placement of the air pump, which is below the water level. A check valve must be used to prevent water from flowing back into the pump and causing damage.

ASIN	B087QZ1F52
Air Flow Capacity	2.66 Gallons Per Minute
Best Sellers Rank	#11,718 in Pet Supplies ( See Top 100 in Pet Supplies ) #22 in Aquarium Air Pumps
Brand	hygger
Brand Name	hygger
Color	Black
Customer Reviews	4.5 out of 5 stars 898 Reviews
EU Spare Part Availability Duration	7 Years
Horsepower	5 Watts
Hose Length	6 Feet
Included Components	Manual
Item Dimensions L x W x H	4.7"L x 3.9"W x 3.5"H
Item Weight	0.84 Kilograms
Manufacturer	hygger
Material	Plastic
Material Type	Plastic
Maximum Pressure	20 Kilopascal
Operation Mode	Automatic
Power Source	Corded Electric
Product Dimensions	4.7"L x 3.9"W x 3.5"H
Unit Count	1.0 Count
Warranty Description	2 YEAR

hygger Quiet <30dB Aquarium Air Pump, Adjustable Low Decibel Oxygen Fish Tank Pump 2 Air Outlets Ultra Silent Powerful Aerator Pump with Accessories Max 80GPH/160GPH/255GPH(5W, Up to 150Gallon)

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