May kalat sa kanal.

In this sentence, may is an existential word. It means there is or there are.

So May kalat sa kanal literally means There is litter in the canal or There is trash in the drain/gutter.

You will often see may at the beginning of sentences when Filipino is introducing the existence of something.

Yes, they are closely related.

• may = short, very common
• mayroon = fuller form, often a bit more careful or formal
• meron = very common spoken form of mayroon

So these are all possible:

• May kalat sa kanal.
• Mayroong kalat sa kanal.
• Merong kalat sa kanal.

All are natural, though may is the simplest and most compact here.

Kalat can refer to mess, scattered things, litter, or trash lying around.

In this sentence, it refers to litter / scattered garbage in the canal.

A useful thing to know is that kalat can also behave like an adjective in other contexts, meaning messy or scattered.

For example:

• Kalat ang kuwarto. = The room is messy.

But in May kalat sa kanal, it is functioning more like a noun: litter / mess.

Because after existential may, Filipino often uses a bare noun without ang.

So:

• May kalat sa kanal. = There is litter in the canal.

This pattern is very common:

• May tao sa labas. = There is a person outside.
• May tubig sa bote. = There is water in the bottle.

Using ang here would not sound right in this structure.

Sa is a very common preposition. Here it means in, at, or on, depending on the situation.

In sa kanal, it marks the location:

• sa kanal = in the canal / in the drain / in the gutter

So the sentence is literally structured like:

• May = there is
• kalat = litter
• sa kanal = in the canal

Kanal usually means canal, drain, or gutter, depending on context.

In everyday urban contexts in the Philippines, kanal often makes English speakers think of a drainage canal or street gutter/drain, not necessarily a large scenic canal.

So May kalat sa kanal could naturally mean:

• There’s trash in the drain
• There’s litter in the gutter
• There’s litter in the canal

The best translation depends on the situation.

Filipino commonly puts the existential word first.

So instead of something like:

• Litter is in the canal

it more naturally says:

• May kalat sa kanal
• literally: There is litter in the canal

This is a very standard Filipino pattern:

• May + thing + location

Examples:

• May pagkain sa mesa. = There is food on the table.
• May pusa sa bubong. = There is a cat on the roof.

It is not very specific about number.

Kalat here is more like litter or mess, so it often feels like a mass noun in English. It can refer to one kind of mess or multiple scattered bits of garbage.

So May kalat sa kanal does not strongly distinguish:

• There is some litter in the canal
• There’s trash in the drain
• There is a mess in the canal

If you want to be more specific, Filipino can add other words, but this sentence leaves it general.

Yes. May basura sa kanal is also very natural.

The difference is roughly this:

• basura = garbage, trash
• kalat = litter, mess, scattered trash

So:

• May basura sa kanal focuses more on the garbage itself.
• May kalat sa kanal suggests that trash is lying around there in a messy or scattered way.

In many contexts, both would work.

Yes, but the nuance changes.

• May kalat sa kanal. = There is litter in the canal.
  This introduces the existence of litter there.

• Nasa kanal ang kalat. = The litter is in the canal.
  This sounds more like the litter is already known, and now you are saying where it is.

So the original sentence is better if you are simply noticing or reporting that litter is present.

A simple pronunciation guide is:

• may ≈ like English my, but shorter and cleaner
• kalat ≈ KAH-lat
• sa ≈ sah
• kanal ≈ kah-NAL

A rough guide for the whole sentence: my KAH-lat sah kah-NAL

Stress is commonly heard like this:

• KA-lat
• ka-NAL

It is neutral and very natural.

It works in normal conversation, simple descriptions, and even basic written Filipino. It does not sound unusually formal or unusually slangy.

If you wanted a slightly fuller version, you could say:

• Mayroong kalat sa kanal.

But May kalat sa kanal is already completely natural.

It is very commonly used when you want to say that something exists somewhere.

The pattern is:

May + noun + location

Examples:

• May tao sa kusina. = There is a person in the kitchen.
• May tubig sa baso. = There is water in the glass.
• May kotse sa labas. = There is a car outside.

So May kalat sa kanal follows a very important and useful Filipino sentence pattern.