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kualitas air

Calm sea surface with algae spread across the shallow waters

hiro先生

Detailed view of a rocky surface with flowing water

住吉音香

Surface of a river with flowing water and bubbles

SAKULAB

Natural scene featuring green water and rocks

yacchin

Ducks foraging in a water surface with litter

くまもりこ

Ducks foraging in a polluted river with floating debris

くまもりこ

A narrow river with low water levels and surrounding buildings

エルエルシー

Polluted water with floating green plants and dry grass

エルエルシー

A fish looking upwards in the water with a textured background of bubbles

あおねこ

Vibrant green algae and ochre terrain on a water surface

fyonetsu

a pH test strip and color chart displayed on a black surface

モノヒョー

pH testing kit color chart with test tube

モノヒョー

Standard color chart for nitrate-nitrogen concentration with test tube

モノヒョー

Image showing standard color chart for nitrate-nitrogen measurement

モノヒョー

Surface of water with ripples and flowing patterns

ookinate23

Smoke emitting chimney against a cloudy sky

tamu1500

Cityscape shrouded in fog with a bridge and greenery

はるいわ

A cityscape under a blue sky with wind turbines in the distance

awesome_photo

Calm sea surface with algae spread across the shallow waters

hiro先生

Surface of a river with flowing water and bubbles

SAKULAB

Ducks foraging in a water surface with litter

くまもりこ

A narrow river with low water levels and surrounding buildings

エルエルシー

A fish looking upwards in the water with a textured background of bubbles

あおねこ

a pH test strip and color chart displayed on a black surface

モノヒョー

Standard color chart for nitrate-nitrogen concentration with test tube

モノヒョー

Surface of water with ripples and flowing patterns

ookinate23

Cityscape shrouded in fog with a bridge and greenery

はるいわ

Detailed view of a rocky surface with flowing water

住吉音香

Natural scene featuring green water and rocks

yacchin

Ducks foraging in a polluted river with floating debris

くまもりこ

Polluted water with floating green plants and dry grass

エルエルシー

Vibrant green algae and ochre terrain on a water surface

fyonetsu

pH testing kit color chart with test tube

モノヒョー

Image showing standard color chart for nitrate-nitrogen measurement

モノヒョー

Smoke emitting chimney against a cloudy sky

tamu1500

A cityscape under a blue sky with wind turbines in the distance

awesome_photo

Calm sea surface with algae spread across the shallow waters

hiro先生

Natural scene featuring green water and rocks

yacchin

A narrow river with low water levels and surrounding buildings

エルエルシー

Vibrant green algae and ochre terrain on a water surface

fyonetsu

Standard color chart for nitrate-nitrogen concentration with test tube

モノヒョー

Smoke emitting chimney against a cloudy sky

tamu1500

Detailed view of a rocky surface with flowing water

住吉音香

Ducks foraging in a water surface with litter

くまもりこ

Polluted water with floating green plants and dry grass

エルエルシー

a pH test strip and color chart displayed on a black surface

モノヒョー

Image showing standard color chart for nitrate-nitrogen measurement

モノヒョー

Cityscape shrouded in fog with a bridge and greenery

はるいわ

Surface of a river with flowing water and bubbles

SAKULAB

Ducks foraging in a polluted river with floating debris

くまもりこ

A fish looking upwards in the water with a textured background of bubbles

あおねこ

pH testing kit color chart with test tube

モノヒョー

Surface of water with ripples and flowing patterns

ookinate23

A cityscape under a blue sky with wind turbines in the distance

awesome_photo